Move gtest_prod_util.h out of webrtc/test tree.

webrtc/common_audio/channel_buffer.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_CHANNEL_BUFFER_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_CHANNEL_BUFFER_H_
 
 #include <string.h>
 
 #include "webrtc/base/checks.h"
+#include "webrtc/base/gtest_prod_util.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/common_audio/include/audio_util.h"
-#include "webrtc/test/testsupport/gtest_prod_util.h"
 
 namespace webrtc {
 
 // Helper to encapsulate a contiguous data buffer, full or split into frequency
 // bands, with access to a pointer arrays of the deinterleaved channels and
 // bands. The buffer is zero initialized at creation.
 //
 // The buffer structure is showed below for a 2 channel and 2 bands case:
 //
 // |data_|:
@@ skipping 130 matching lines @@
 
   mutable bool ivalid_;
   mutable ChannelBuffer<int16_t> ibuf_;
   mutable bool fvalid_;
   mutable ChannelBuffer<float> fbuf_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_CHANNEL_BUFFER_H_