Switch the visibility of static field `PARSER` in Java gencode to `private`.

PiperOrigin-RevId: 472529298

src/google/protobuf/compiler/java/message.cc

diff --git a/src/google/protobuf/compiler/java/message.cc b/src/google/protobuf/compiler/java/message.cc
index 2b249ad..f82e18f 100644
--- a/src/google/protobuf/compiler/java/message.cc
+++ b/src/google/protobuf/compiler/java/message.cc
@@ -1162,7 +1162,7 @@
 // ===================================================================
 void ImmutableMessageGenerator::GenerateParser(io::Printer* printer) {
   printer->Print(
-      "$visibility$ static final com.google.protobuf.Parser<$classname$>\n"
+      "private static final com.google.protobuf.Parser<$classname$>\n"
       "    PARSER = new com.google.protobuf.AbstractParser<$classname$>() {\n"
       "  @java.lang.Override\n"
       "  public $classname$ parsePartialFrom(\n"
@@ -1195,9 +1195,6 @@
       "  return PARSER;\n"
       "}\n"
       "\n",
-      "visibility",
-      ExposePublicParser(descriptor_->file()) ? "@java.lang.Deprecated public"
-                                              : "private",
       "classname", descriptor_->name());
 }
 

src/google/protobuf/compiler/java/message_field.cc

diff --git a/src/google/protobuf/compiler/java/message_field.cc b/src/google/protobuf/compiler/java/message_field.cc
index d7cf214..5c82038 100644
--- a/src/google/protobuf/compiler/java/message_field.cc
+++ b/src/google/protobuf/compiler/java/message_field.cc
@@ -83,11 +83,7 @@
            : ""});
   (*variables)["on_changed"] = "onChanged();";
   (*variables)["ver"] = GeneratedCodeVersionSuffix();
-  (*variables)["get_parser"] =
-      ExposePublicParser(descriptor->message_type()->file()) &&
-              context->options().opensource_runtime
-          ? "PARSER"
-          : "parser()";
+  (*variables)["get_parser"] = "parser()";
 
   if (HasHasbit(descriptor)) {
     // For singular messages and builders, one bit is used for the hasField bit.