Additional whitespace.

Signed-off-by: Harvey Tuch <htuch@google.com>

src/google/protobuf/util/json_util.cc

diff --git a/src/google/protobuf/util/json_util.cc b/src/google/protobuf/util/json_util.cc
index dd8c611..9ad073d 100644
--- a/src/google/protobuf/util/json_util.cc
+++ b/src/google/protobuf/util/json_util.cc
@@ -127,7 +127,7 @@
   virtual void InvalidName(const converter::LocationTrackerInterface& loc,
                            StringPiece unknown_name, StringPiece message) {
     status_ = util::Status(util::error::INVALID_ARGUMENT,
-                           loc.ToString() + ":invalid name " +
+                           loc.ToString() + ": invalid name " +
                                string(unknown_name) + ": " + string(message));
   }