Reland: Pass task runners to AudioManager constructor.

content/browser/renderer_host/media/audio_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_renderer_host.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 466 matching lines @@
   }
 
   // If enumerator caching is disabled, avoid the enumeration if the default
   // device is requested, since no device ID translation is needed.
   // If enumerator caching is enabled, it is better to use its cache, even
   // for the default device.
   if (media::AudioManagerBase::IsDefaultDeviceId(device_id) &&
       !media_stream_manager_->audio_output_device_enumerator()
            ->IsCacheEnabled()) {
     base::PostTaskAndReplyWithResult(
-        audio_manager_->GetTaskRunner().get(), FROM_HERE,
+        audio_manager_->GetTaskRunner(), FROM_HERE,
         base::Bind(&GetDefaultDeviceInfoOnDeviceThread, audio_manager_),
         base::Bind(&AudioRendererHost::OnDeviceIDTranslated, this, stream_id,
                    true));
   } else {
     media_stream_manager_->audio_output_device_enumerator()->Enumerate(
         base::Bind(&AudioRendererHost::TranslateDeviceID, this, device_id,
                    gurl_security_origin,
                    base::Bind(&AudioRendererHost::OnDeviceIDTranslated, this,
                               stream_id)));
   }
@@ skipping 317 matching lines @@
   callback.Run(false, device_info);
 }
 
 bool AudioRendererHost::IsAuthorizationStarted(int stream_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   const auto& i = authorizations_.find(stream_id);
   return i != authorizations_.end();
 }
 
 }  // namespace content