Convert MediaControlElements timer to UnspecedTimer per-frame TaskRunnerTimer.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 45 matching lines @@
   bool keepEventInNode(Event*) override;
 
   void startTimer();
   void stopTimer();
   void transitionTimerFired(TimerBase*);
   void didBecomeVisible();
 
   bool m_isDisplayed;
   bool m_opaque;
 
-  Timer<MediaControlPanelElement> m_transitionTimer;
+  TaskRunnerTimer<MediaControlPanelElement> m_transitionTimer;
 };
 
 // ----------------------------
 
 class MediaControlPanelEnclosureElement final : public MediaControlDivElement {
  public:
   static MediaControlPanelEnclosureElement* create(MediaControls&);
 
  private:
   explicit MediaControlPanelEnclosureElement(MediaControls&);
@@ skipping 287 matching lines @@
  public:
   static MediaControlCurrentTimeDisplayElement* create(MediaControls&);
 
  private:
   explicit MediaControlCurrentTimeDisplayElement(MediaControls&);
 };
 
 }  // namespace blink
 
 #endif  // MediaControlElements_h