Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/core/events/GenericEventQueue.h

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 33 matching lines @@
     DECLARE_VIRTUAL_TRACE();
     bool enqueueEvent(Event*) override;
     bool cancelEvent(Event*) override;
     void close() override;
 
     void cancelAllEvents();
     bool hasPendingEvents() const;
 
 private:
     explicit GenericEventQueue(EventTarget*);
-    void timerFired(Timer<GenericEventQueue>*);
+    void timerFired(TimerBase*);
 
     Member<EventTarget> m_owner;
     HeapVector<Member<Event>> m_pendingEvents;
     Timer<GenericEventQueue> m_timer;
 
     bool m_isClosed;
 };
 
 } // namespace blink
 
 #endif