Enable cpplint and fix cpplint errors in webrtc/*audio

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_
+#ifndef WEBRTC_COMMON_AUDIO_CHANNEL_BUFFER_H_
+#define WEBRTC_COMMON_AUDIO_CHANNEL_BUFFER_H_
 
 #include <string.h>
 
 #include <memory>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/gtest_prod_util.h"
 #include "webrtc/common_audio/include/audio_util.h"
 
 namespace webrtc {
@@ skipping 153 matching lines @@
   void RefreshI() const;
 
   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_
+#endif  // WEBRTC_COMMON_AUDIO_CHANNEL_BUFFER_H_