Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/generated_enum_reflection.h

Index: third_party/protobuf/src/google/protobuf/generated_enum_reflection.h
diff --git a/third_party/protobuf/src/google/protobuf/generated_enum_reflection.h b/third_party/protobuf/src/google/protobuf/generated_enum_reflection.h
index a09a540bf540f0a8c22b37dfb3664964eb0ec43a..fdcdc277909eed444ff8d7fd7bc897a9b3cfc745 100644
--- a/third_party/protobuf/src/google/protobuf/generated_enum_reflection.h
+++ b/third_party/protobuf/src/google/protobuf/generated_enum_reflection.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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
@@ -41,6 +41,9 @@
 
 #include <string>
 
+#include <google/protobuf/stubs/template_util.h>
+#include <google/protobuf/generated_enum_util.h>
+
 namespace google {
 namespace protobuf {
   class EnumDescriptor;