Reland of Loosening the coupling between WebRTC and //third_party/protobuf

webrtc/modules/audio_processing/test/protobuf_utils.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 12 matching lines @@
   if (fread(&size, sizeof(size), 1, file) != 1)
     return 0;
   if (size <= 0)
     return 0;
 
   bytes->reset(new uint8_t[size]);
   return fread(bytes->get(), sizeof((*bytes)[0]), size, file);
 }
 
 // Returns true on success, false on error or end-of-file.
-bool ReadMessageFromFile(FILE* file, ::google::protobuf::MessageLite* msg) {
+bool ReadMessageFromFile(FILE* file, MessageLite* msg) {
   std::unique_ptr<uint8_t[]> bytes;
   size_t size = ReadMessageBytesFromFile(file, &bytes);
   if (!size)
     return false;
 
   msg->Clear();
   return msg->ParseFromArray(bytes.get(), size);
 }
 
 }  // namespace webrtc