Enable the -Wundef warning for clang

webrtc/common_audio/blocker_unittest.cc

 /*
  *  Copyright (c) 2014 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 <memory>
 
 #include "webrtc/common_audio/blocker.h"
 
-#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/gtest.h"

[kjellander_webrtc, 2016/09/23 12:32:37]

sort

 #include "webrtc/base/arraysize.h"
 
 namespace {
 
 // Callback Function to add 3 to every sample in the signal.
 class PlusThreeBlockerCallback : public webrtc::BlockerCallback {
  public:
   void ProcessBlock(const float* const* input,
                     size_t num_frames,
                     size_t num_input_channels,
@@ skipping 310 matching lines @@
             kNumOutputChannels);
 
     ValidateInitialDelay(output_cb.channels(),
                          kNumOutputChannels,
                          kNumFrames,
                          kInitialDelay[i]);
   }
 }
 
 }  // namespace webrtc