Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/voice_engine/channel.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 657 matching lines @@
 
   float output_gain = 1.0f;
   {
     rtc::CritScope cs(&volume_settings_critsect_);
     output_gain = _outputGain;
   }
 
   // Output volume scaling
   if (output_gain < 0.99f || output_gain > 1.01f) {
     // TODO(solenberg): Combine with mute state - this can cause clicks!
-    AudioFrameOperations::ScaleWithSat(output_gain, *audioFrame);
+    AudioFrameOperations::ScaleWithSat(output_gain, audioFrame);
   }
 
   // Mix decoded PCM output with file if file mixing is enabled
   if (state.output_file_playing) {
     MixAudioWithFile(*audioFrame, audioFrame->sample_rate_hz_);
     muted = false;  // We may have added non-zero samples.
   }
 
   // Record playout if enabled
   {
@@ skipping 2321 matching lines @@
   int64_t min_rtt = 0;
   if (_rtpRtcpModule->RTT(remoteSSRC, &rtt, &avg_rtt, &min_rtt, &max_rtt) !=
       0) {
     return 0;
   }
   return rtt;
 }
 
 }  // namespace voe
 }  // namespace webrtc