Remove all remaining traces of MessageLoopProxy.

content/browser/media/media_web_contents_observer.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/media_web_contents_observer.h"
 
 #include <memory>
 
 #include "base/lazy_instance.h"
 #include "build/build_config.h"
@@ skipping 168 matching lines @@
   WebContentsImpl* wci = static_cast<WebContentsImpl*>(web_contents());
   for (const auto& id : removed_players)
     wci->MediaStoppedPlaying(id);
 }
 
 void MediaWebContentsObserver::CreateAudioPowerSaveBlocker() {
   DCHECK(!audio_power_save_blocker_);
   audio_power_save_blocker_.reset(new device::PowerSaveBlocker(
       device::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
       device::PowerSaveBlocker::kReasonAudioPlayback, "Playing audio",
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
 }
 
 void MediaWebContentsObserver::CreateVideoPowerSaveBlocker() {
   DCHECK(!video_power_save_blocker_);
   DCHECK(!active_video_players_.empty());
   video_power_save_blocker_.reset(new device::PowerSaveBlocker(
       device::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
       device::PowerSaveBlocker::kReasonVideoPlayback, "Playing video",
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
 #if defined(OS_ANDROID)
   if (web_contents()->GetNativeView()) {
     view_weak_factory_.reset(new base::WeakPtrFactory<ui::ViewAndroid>(
         web_contents()->GetNativeView()));
     video_power_save_blocker_.get()->InitDisplaySleepBlocker(
         view_weak_factory_->GetWeakPtr());
   }
 #endif
 }
 
@@ skipping 44 matching lines @@
   if (it == player_map->end())
     return;
 
   for (int delegate_id : it->second)
     removed_players->insert(MediaPlayerId(render_frame_host, delegate_id));
 
   player_map->erase(it);
 }
 
 }  // namespace content