Revert 276939 "Decouple IPC::MessageFilter from IPC::Channel"

content/browser/renderer_host/media/audio_input_renderer_host.cc

 // Copyright (c) 2012 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/browser/renderer_host/media/audio_input_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/numerics/safe_math.h"
@@ skipping 52 matching lines @@
       user_input_monitor_(user_input_monitor),
       audio_log_(MediaInternals::GetInstance()->CreateAudioLog(
           media::AudioLogFactory::AUDIO_INPUT_CONTROLLER)) {}
 
 AudioInputRendererHost::~AudioInputRendererHost() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(audio_entries_.empty());
 }
 
 void AudioInputRendererHost::OnChannelClosing() {
-  // Since the IPC sender is gone, close all requested audio streams.
+  // Since the IPC channel is gone, close all requested audio streams.
   DeleteEntries();
 }
 
 void AudioInputRendererHost::OnDestruct() const {
   BrowserThread::DeleteOnIOThread::Destruct(this);
 }
 
 void AudioInputRendererHost::OnCreated(
     media::AudioInputController* controller) {
   BrowserThread::PostTask(
@@ skipping 380 matching lines @@
   // TODO(hclam): Implement a faster look up method.
   for (AudioEntryMap::iterator i = audio_entries_.begin();
        i != audio_entries_.end(); ++i) {
     if (controller == i->second->controller.get())
       return i->second;
   }
   return NULL;
 }
 
 }  // namespace content