Enable the -Wundef warning for clang

webrtc/modules/audio_device/fine_audio_buffer_unittest.cc

 /*
  *  Copyright (c) 2013 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_device/fine_audio_buffer.h"
 
 #include <limits.h>
 #include <memory>
 
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/test/gmock.h"
+#include "webrtc/test/gtest.h"
 #include "webrtc/modules/audio_device/mock_audio_device_buffer.h"
 
 using ::testing::_;
 using ::testing::AtLeast;
 using ::testing::InSequence;
 using ::testing::Return;
 
 namespace webrtc {
 
 // The fake audio data is 0,1,..SCHAR_MAX-1,0,1,... This is to make it easy
@@ skipping 109 matching lines @@
 }
 
 TEST(FineBufferTest, GreaterThan10ms) {
   const int kSampleRate = 44100;
   const int kSamplesPer10Ms = kSampleRate * 10 / 1000;
   const int kFrameSizeSamples = kSamplesPer10Ms + 50;
   RunFineBufferTest(kSampleRate, kFrameSizeSamples);
 }
 
 }  // namespace webrtc