Add RetainedRef uses where needed.

content/browser/media/capture/web_contents_audio_muter.cc

 // Copyright 2014 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/media/capture/web_contents_audio_muter.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "content/browser/media/capture/audio_mirroring_manager.h"
@@ skipping 115 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   StopMuting();
 }
 
 void WebContentsAudioMuter::StartMuting() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (is_muting_)
     return;
   is_muting_ = true;
   BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
+      BrowserThread::IO, FROM_HERE,
       base::Bind(&AudioMirroringManager::StartMirroring,
                  base::Unretained(AudioMirroringManager::GetInstance()),
-                 destination_));
+                 base::RetainedRef(destination_)));
 }
 
 void WebContentsAudioMuter::StopMuting() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!is_muting_)
     return;
   is_muting_ = false;
   BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
+      BrowserThread::IO, FROM_HERE,
       base::Bind(&AudioMirroringManager::StopMirroring,
                  base::Unretained(AudioMirroringManager::GetInstance()),
-                 destination_));
+                 base::RetainedRef(destination_)));
 }
 
 }  // namespace content