Reland of 'Move content/browser/power_save_blocker to //device/power_save_blocker'

content/browser/media/media_web_contents_observer.h

 // 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/macros.h"
 #include "content/browser/media/session/media_session_controllers_manager.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/web_contents_observer.h"
 
 #if defined(OS_ANDROID)
 #include "ui/android/view_android.h"
 #endif  // OS_ANDROID
 
+namespace device {
+class PowerSaveBlocker;
+}  // namespace device
+
 namespace content {
 
-class PowerSaveBlocker;
-
 // This class manages all RenderFrame based media related managers at the
 // browser side. It receives IPC messages from media RenderFrameObservers and
 // forwards them to the corresponding managers. The managers are responsible
 // for sending IPCs back to the RenderFrameObservers at the render side.
 class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
  public:
   explicit MediaWebContentsObserver(WebContents* web_contents);
   ~MediaWebContentsObserver() override;
 
   // Called by WebContentsImpl when the audible state may have changed.
@@ skipping 54 matching lines @@
                               ActiveMediaPlayerMap* player_map);
   // Removes all entries from |player_map| for |render_frame_host|. Removed
   // entries are added to |removed_players|.
   void RemoveAllMediaPlayerEntries(RenderFrameHost* render_frame_host,
                                    ActiveMediaPlayerMap* player_map,
                                    std::set<MediaPlayerId>* removed_players);
 
   // Tracking variables and associated power save blockers for media playback.
   ActiveMediaPlayerMap active_audio_players_;
   ActiveMediaPlayerMap active_video_players_;
-  std::unique_ptr<PowerSaveBlocker> audio_power_save_blocker_;
-  std::unique_ptr<PowerSaveBlocker> video_power_save_blocker_;
+  std::unique_ptr<device::PowerSaveBlocker> audio_power_save_blocker_;
+  std::unique_ptr<device::PowerSaveBlocker> video_power_save_blocker_;
 #if defined(OS_ANDROID)
   std::unique_ptr<base::WeakPtrFactory<ui::ViewAndroid>> view_weak_factory_;
 #endif
 
   MediaSessionControllersManager session_controllers_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_