Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/src/google/protobuf/compiler/parser.cc

 // 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.
@@ skipping 526 matching lines @@
 
     if (require_syntax_identifier_ || LookingAt("syntax")) {
       if (!ParseSyntaxIdentifier(root_location)) {
         // Don't attempt to parse the file if we didn't recognize the syntax
         // identifier.
         return false;
       }
       // Store the syntax into the file.
       if (file != NULL) file->set_syntax(syntax_identifier_);
     } else if (!stop_after_syntax_identifier_) {
-      GOOGLE_LOG(WARNING) << "No syntax specified for the proto file. "
-                   << "Please use 'syntax = \"proto2\";' or "
-                   << "'syntax = \"proto3\";' to specify a syntax "
+      GOOGLE_LOG(WARNING) << "No syntax specified for the proto file: "
+                   << file->name() << ". Please use 'syntax = \"proto2\";' "
+                   << "or 'syntax = \"proto3\";' to specify a syntax "
                    << "version. (Defaulted to proto2 syntax.)";
       syntax_identifier_ = "proto2";
     }
 
     if (stop_after_syntax_identifier_) return !had_errors_;
 
     // Repeatedly parse statements until we reach the end of the file.
     while (!AtEnd()) {
       if (!ParseTopLevelStatement(file, root_location)) {
         // This statement failed to parse.  Skip it, but keep looping to parse
@@ skipping 1540 matching lines @@
       std::make_pair(line, column);
 }
 
 void SourceLocationTable::Clear() {
   location_map_.clear();
 }
 
 }  // namespace compiler
 }  // namespace protobuf
 }  // namespace google