Convert PlatformEventController Timer to use Unspeced frame-based timer.

third_party/WebKit/Source/core/frame/PlatformEventController.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 PlatformEventController_h
 #define PlatformEventController_h
 
 #include "core/CoreExport.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/page/PageVisibilityObserver.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 // Base controller class for registering controllers with a dispatcher.
 // It watches page visibility and calls stopUpdating when page is not visible.
 // It provides a didUpdateData() callback method which is called when new data
 // it available.
@@ skipping 18 matching lines @@
 
   bool m_hasEventListener;
 
  private:
   // Inherited from PageVisibilityObserver.
   void pageVisibilityChanged() override;
 
   void oneShotCallback(TimerBase*);
 
   bool m_isActive;
-  Timer<PlatformEventController> m_timer;
+  TaskRunnerTimer<PlatformEventController> m_timer;
 };
 
 }  // namespace blink
 
 #endif  // PlatformEventController_h