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

webrtc/modules/audio_coding/neteq/neteq_unittest.cc

 /*
  *  Copyright (c) 2011 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.
  */
 
 #include "webrtc/modules/audio_coding/neteq/include/neteq.h"
 
 #include <math.h>
 #include <stdlib.h>
 #include <string.h>  // memset
 
 #include <algorithm>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "gflags/gflags.h"
 #include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "webrtc/base/ignore_wundef.h"
 #include "webrtc/base/sha1digest.h"
 #include "webrtc/base/stringencode.h"
-#include "webrtc/base/protobuf_utils.h"
 #include "webrtc/modules/audio_coding/codecs/pcm16b/pcm16b.h"
 #include "webrtc/modules/audio_coding/neteq/tools/audio_loop.h"
 #include "webrtc/modules/audio_coding/neteq/tools/rtp_file_source.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/test/gtest.h"
 #include "webrtc/test/testsupport/fileutils.h"
 #include "webrtc/typedefs.h"
 
 #ifdef WEBRTC_NETEQ_UNITTEST_BITEXACT
 RTC_PUSH_IGNORING_WUNDEF()
@@ skipping 149 matching lines @@
     ASSERT_EQ(length, fwrite(&test_results, sizeof(T), length, output_fp_));
   }
   digest_->Update(&test_results, sizeof(T) * length);
 }
 
 void ResultSink::AddResult(const NetEqNetworkStatistics& stats_raw) {
 #ifdef WEBRTC_NETEQ_UNITTEST_BITEXACT
   neteq_unittest::NetEqNetworkStatistics stats;
   Convert(stats_raw, &stats);
 
-  ProtoString stats_string;
+  std::string stats_string;
   ASSERT_TRUE(stats.SerializeToString(&stats_string));
   AddMessage(output_fp_, digest_.get(), stats_string);
 #else
   FAIL() << "Writing to reference file requires Proto Buffer.";
 #endif  // WEBRTC_NETEQ_UNITTEST_BITEXACT
 }
 
 void ResultSink::AddResult(const RtcpStatistics& stats_raw) {
 #ifdef WEBRTC_NETEQ_UNITTEST_BITEXACT
   neteq_unittest::RtcpStatistics stats;
   Convert(stats_raw, &stats);
 
-  ProtoString stats_string;
+  std::string stats_string;
   ASSERT_TRUE(stats.SerializeToString(&stats_string));
   AddMessage(output_fp_, digest_.get(), stats_string);
 #else
   FAIL() << "Writing to reference file requires Proto Buffer.";
 #endif  // WEBRTC_NETEQ_UNITTEST_BITEXACT
 }
 
 void ResultSink::VerifyChecksum(const std::string& checksum) {
   std::vector<char> buffer;
   buffer.resize(digest_->Size());
@@ skipping 1361 matching lines @@
     if (muted) {
       EXPECT_TRUE(AudioFramesEqualExceptData(out_frame1, out_frame2));
     } else {
       EXPECT_TRUE(AudioFramesEqual(out_frame1, out_frame2));
     }
   }
   EXPECT_FALSE(muted);
 }
 
 }  // namespace webrtc