Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index a9b9f3a92d848ae2a7179b626bf595c23f9e0769..bb25cea3b377ca24caa233d9c279fd589a31ac52 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -678,7 +678,7 @@ MixerParticipant::AudioFrameInfo Channel::GetAudioFrameWithMuted(
 
   // 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
@@ -695,7 +695,7 @@ MixerParticipant::AudioFrameInfo Channel::GetAudioFrameWithMuted(
 
     // 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