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

third_party/protobuf/src/google/protobuf/compiler/main.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 60 matching lines @@
   cli.RegisterGenerator("--ruby_out", &rb_generator,
                         "Generate Ruby source file.");
 
   // CSharp
   google::protobuf::compiler::csharp::Generator csharp_generator;
   cli.RegisterGenerator("--csharp_out", "--csharp_opt", &csharp_generator,
                         "Generate C# source file.");
 
   // Objective C
   google::protobuf::compiler::objectivec::ObjectiveCGenerator objc_generator;
-  cli.RegisterGenerator("--objc_out", &objc_generator,
+  cli.RegisterGenerator("--objc_out", "--objc_opt", &objc_generator,
                         "Generate Objective C header and source.");
 
   // JavaScript
   google::protobuf::compiler::js::Generator js_generator;
   cli.RegisterGenerator("--js_out", &js_generator,
                         "Generate JavaScript source.");
 
   return cli.Run(argc, argv);
 }