Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/voice_engine/output_mixer.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 417 matching lines @@
         if (_audioFrame.num_channels_ == 1)
         {
             AudioFrameOperations::MonoToStereo(&_audioFrame);
         }
         else
         {
             // Pure stereo mode (we are receiving a stereo signal).
         }
 
         assert(_audioFrame.num_channels_ == 2);
-        AudioFrameOperations::Scale(_panLeft, _panRight, _audioFrame);
+        AudioFrameOperations::Scale(_panLeft, _panRight, &_audioFrame);
     }
 
     // --- Far-end Voice Quality Enhancement (AudioProcessing Module)
     if (feed_data_to_apm) {
       if (_audioProcessingModulePtr->ProcessReverseStream(&_audioFrame) != 0) {
         WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
                      "AudioProcessingModule::ProcessReverseStream() => error");
         RTC_NOTREACHED();
       }
     }
 
     // --- Measure audio level (0-9) for the combined signal
     _audioLevel.ComputeLevel(_audioFrame);
 
     return 0;
 }
 }  // namespace voe
 }  // namespace webrtc