Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/blocker.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_INTERNAL_BEAMFORMER_BLOCKER_H_
-#define WEBRTC_INTERNAL_BEAMFORMER_BLOCKER_H_
+#ifndef WEBRTC_COMMON_AUDIO_BLOCKER_H_
+#define WEBRTC_COMMON_AUDIO_BLOCKER_H_
 
 #include <memory>
 
 #include "webrtc/common_audio/audio_ring_buffer.h"
 #include "webrtc/common_audio/channel_buffer.h"
 
 namespace webrtc {
 
 // The callback function to process audio in the time domain. Input has already
 // been windowed, and output will be windowed. The number of input channels
@@ skipping 94 matching lines @@
 
   // The amount of frames between the start of contiguous blocks. For example,
   // |shift_amount_| = |block_size_| / 2 for a Hann window.
   size_t shift_amount_;
 
   BlockerCallback* callback_;
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_INTERNAL_BEAMFORMER_BLOCKER_H_
+#endif  // WEBRTC_COMMON_AUDIO_BLOCKER_H_