Reland of Pass SequencedTaskRunner to PowerSaveBlocker for ui/file ops

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"
 #include "content/browser/media/audible_metrics.h"
 #include "content/browser/media/audio_stream_monitor.h"
 #include "content/browser/power_save_blocker_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/media/media_player_delegate_messages.h"
+#include "content/public/browser/power_save_blocker_factory.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "ipc/ipc_message_macros.h"
 
 namespace content {
 
 namespace {
 
 static base::LazyInstance<AudibleMetrics>::Leaky g_audible_metrics =
     LAZY_INSTANCE_INITIALIZER;
@@ skipping 147 matching lines @@
   MaybeReleasePowerSaveBlockers();
 
   // Notify all observers the player has been "paused".
   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_ = PowerSaveBlocker::Create(
+  audio_power_save_blocker_ = CreatePowerSaveBlocker(
       PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
       PowerSaveBlocker::kReasonAudioPlayback, "Playing audio");
 }
 
 void MediaWebContentsObserver::CreateVideoPowerSaveBlocker() {
   DCHECK(!video_power_save_blocker_);
   DCHECK(!active_video_players_.empty());
-  video_power_save_blocker_ = PowerSaveBlocker::Create(
+  video_power_save_blocker_ = CreatePowerSaveBlocker(
       PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
       PowerSaveBlocker::kReasonVideoPlayback, "Playing video");
 #if defined(OS_ANDROID)
   static_cast<PowerSaveBlockerImpl*>(video_power_save_blocker_.get())
       ->InitDisplaySleepBlocker(web_contents());
 #endif
 }
 
 void MediaWebContentsObserver::MaybeReleasePowerSaveBlockers() {
   // If there are no more audio players and we don't have audio stream
@@ skipping 42 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