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 660 matching lines @@
   float right_pan = 1.0f;
   {
     rtc::CritScope cs(&volume_settings_critsect_);
     output_gain = _outputGain;
     left_pan = _panLeft;
     right_pan = _panRight;
   }
 
   // Output volume scaling
   if (output_gain < 0.99f || output_gain > 1.01f) {
-    AudioFrameOperations::ScaleWithSat(output_gain, *audioFrame);
+    AudioFrameOperations::ScaleWithSat(output_gain, audioFrame);
   }
 
   // Scale left and/or right channel(s) if stereo and master balance is
   // active
 
   if (left_pan != 1.0f || right_pan != 1.0f) {
     if (audioFrame->num_channels_ == 1) {
       // Emulate stereo mode since panning is active.
       // The mono signal is copied to both left and right channels here.
       AudioFrameOperations::MonoToStereo(audioFrame);
     }
     // For true stereo mode (when we are receiving a stereo signal), no
     // action is needed.
 
     // Do the panning operation (the audio frame contains stereo at this
     // stage)
-    AudioFrameOperations::Scale(left_pan, right_pan, *audioFrame);
+    AudioFrameOperations::Scale(left_pan, right_pan, 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 2355 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