ObjC Cleanups.

- Add missing license to testing header.
- Standardize license blocks.
- Fix some trailing whitespace.

PiperOrigin-RevId: 485683549
diff --git a/objectivec/GPBMessage.m b/objectivec/GPBMessage.m
index 1d26392..5a9c53e 100644
--- a/objectivec/GPBMessage.m
+++ b/objectivec/GPBMessage.m
@@ -89,7 +89,7 @@
   //   http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
   //   https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html
   // It was changed to a dispatch_semaphore_t, but that has potential for priority inversion issues.
-  // The minOS versions are now high enough that os_unfair_lock can be used, and should provide 
+  // The minOS versions are now high enough that os_unfair_lock can be used, and should provide
   // all the support we need. For more information in the concurrency/locking space see:
   //   https://gist.github.com/tclementdev/6af616354912b0347cdf6db159c37057
   //   https://developer.apple.com/library/archive/documentation/Performance/Conceptual/EnergyGuide-iOS/PrioritizeWorkWithQoS.html
diff --git a/objectivec/GPBRootObject.m b/objectivec/GPBRootObject.m
index b546959..d013b2d 100644
--- a/objectivec/GPBRootObject.m
+++ b/objectivec/GPBRootObject.m
@@ -102,7 +102,7 @@
 //   http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
 //   https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html
 // It was changed to a dispatch_semaphore_t, but that has potential for priority inversion issues.
-// The minOS versions are now high enough that os_unfair_lock can be used, and should provide 
+// The minOS versions are now high enough that os_unfair_lock can be used, and should provide
 // all the support we need. For more information in the concurrency/locking space see:
 //   https://gist.github.com/tclementdev/6af616354912b0347cdf6db159c37057
 //   https://developer.apple.com/library/archive/documentation/Performance/Conceptual/EnergyGuide-iOS/PrioritizeWorkWithQoS.html
diff --git a/objectivec/Tests/UnitTests-Bridging-Header.h b/objectivec/Tests/UnitTests-Bridging-Header.h
index 6d3d9ec..c5b651c 100644
--- a/objectivec/Tests/UnitTests-Bridging-Header.h
+++ b/objectivec/Tests/UnitTests-Bridging-Header.h
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 //
 //  Use this file to import your target's public headers that you would like to
 //  expose to Swift.
diff --git a/objectivec/Tests/unittest_cycle.proto b/objectivec/Tests/unittest_cycle.proto
index 91e33ce..850fdba 100644
--- a/objectivec/Tests/unittest_cycle.proto
+++ b/objectivec/Tests/unittest_cycle.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_deprecated.proto b/objectivec/Tests/unittest_deprecated.proto
index aa06a06..9d09a9a 100644
--- a/objectivec/Tests/unittest_deprecated.proto
+++ b/objectivec/Tests/unittest_deprecated.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_deprecated_file.proto b/objectivec/Tests/unittest_deprecated_file.proto
index b32b4b4..5481032 100644
--- a/objectivec/Tests/unittest_deprecated_file.proto
+++ b/objectivec/Tests/unittest_deprecated_file.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_a.proto b/objectivec/Tests/unittest_extension_chain_a.proto
index 2e09a40..aceeed3 100644
--- a/objectivec/Tests/unittest_extension_chain_a.proto
+++ b/objectivec/Tests/unittest_extension_chain_a.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_b.proto b/objectivec/Tests/unittest_extension_chain_b.proto
index 5cf7ea3..a9f3947 100644
--- a/objectivec/Tests/unittest_extension_chain_b.proto
+++ b/objectivec/Tests/unittest_extension_chain_b.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_c.proto b/objectivec/Tests/unittest_extension_chain_c.proto
index b07b288..a8d4862 100644
--- a/objectivec/Tests/unittest_extension_chain_c.proto
+++ b/objectivec/Tests/unittest_extension_chain_c.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_d.proto b/objectivec/Tests/unittest_extension_chain_d.proto
index 44d9ee8..5c91a1b 100644
--- a/objectivec/Tests/unittest_extension_chain_d.proto
+++ b/objectivec/Tests/unittest_extension_chain_d.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_e.proto b/objectivec/Tests/unittest_extension_chain_e.proto
index 9c7cea8..bf63e8a 100644
--- a/objectivec/Tests/unittest_extension_chain_e.proto
+++ b/objectivec/Tests/unittest_extension_chain_e.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_f.proto b/objectivec/Tests/unittest_extension_chain_f.proto
index 33fcaf9..5f9196b 100644
--- a/objectivec/Tests/unittest_extension_chain_f.proto
+++ b/objectivec/Tests/unittest_extension_chain_f.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_extension_chain_g.proto b/objectivec/Tests/unittest_extension_chain_g.proto
index 9044e46..7b228ae 100644
--- a/objectivec/Tests/unittest_extension_chain_g.proto
+++ b/objectivec/Tests/unittest_extension_chain_g.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_objc.proto b/objectivec/Tests/unittest_objc.proto
index c7e4034..48db856 100644
--- a/objectivec/Tests/unittest_objc.proto
+++ b/objectivec/Tests/unittest_objc.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2011 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_runtime_proto2.proto b/objectivec/Tests/unittest_runtime_proto2.proto
index 12c2b1c..b2f0ceb 100644
--- a/objectivec/Tests/unittest_runtime_proto2.proto
+++ b/objectivec/Tests/unittest_runtime_proto2.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
diff --git a/objectivec/Tests/unittest_runtime_proto3.proto b/objectivec/Tests/unittest_runtime_proto3.proto
index d6d4380..2a2fb66 100644
--- a/objectivec/Tests/unittest_runtime_proto3.proto
+++ b/objectivec/Tests/unittest_runtime_proto3.proto
@@ -1,5 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are