Remove unused fields from //content.

content/renderer/media/webrtc_audio_device_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webrtc_audio_device_impl.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "base/win/windows_version.h"
 #include "content/renderer/media/media_stream_audio_processor.h"
 #include "content/renderer/media/webrtc_audio_capturer.h"
 #include "content/renderer/media/webrtc_audio_renderer.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/audio/audio_parameters.h"
 #include "media/audio/sample_rates.h"
 
 using media::AudioParameters;
 using media::ChannelLayout;
 
 namespace content {
 
 WebRtcAudioDeviceImpl::WebRtcAudioDeviceImpl()
     : ref_count_(0),
       audio_transport_callback_(NULL),
       output_delay_ms_(0),
       initialized_(false),
       playing_(false),
-      recording_(false),
-      microphone_volume_(0) {
+      recording_(false) {
   DVLOG(1) << "WebRtcAudioDeviceImpl::WebRtcAudioDeviceImpl()";
   // This object can be constructed on either the signaling thread or the main
   // thread, so we need to detach these thread checkers here and have them
   // initialize automatically when the first methods are called.
   signaling_thread_checker_.DetachFromThread();
   main_thread_checker_.DetachFromThread();
 
   worker_thread_checker_.DetachFromThread();
   audio_renderer_thread_checker_.DetachFromThread();
 }
@@ skipping 440 matching lines @@
 
   *session_id = device_info.session_id;
   *output_sample_rate = device_info.device.matched_output.sample_rate;
   *output_frames_per_buffer =
       device_info.device.matched_output.frames_per_buffer;
 
   return true;
 }
 
 }  // namespace content