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

content/browser/media/media_web_contents_observer.h

Index: content/browser/media/media_web_contents_observer.h
diff --git a/content/browser/media/media_web_contents_observer.h b/content/browser/media/media_web_contents_observer.h
index 281e3e32c78bd33a88984710d2b05a3ccccb3ab4..540a921f28ae9c5f6d0d35415dc039e58c24a6c0 100644
--- a/content/browser/media/media_web_contents_observer.h
+++ b/content/browser/media/media_web_contents_observer.h
@@ -20,9 +20,11 @@
 #include "ui/android/view_android.h"
 #endif  // OS_ANDROID
 
-namespace content {
-
+namespace device {
 class PowerSaveBlocker;
+}  // namespace device
+
+namespace content {
 
 // This class manages all RenderFrame based media related managers at the
 // browser side. It receives IPC messages from media RenderFrameObservers and
@@ -98,8 +100,8 @@ class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
   // 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