Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/core/dom/MainThreadTaskRunner.cpp

 /*
  * Copyright (C) 2013 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 84 matching lines @@
 
 void MainThreadTaskRunner::resume()
 {
     DCHECK(m_suspended);
     if (!m_pendingTasks.isEmpty())
         m_pendingTasksTimer.startOneShot(0, BLINK_FROM_HERE);
 
     m_suspended = false;
 }
 
-void MainThreadTaskRunner::pendingTasksTimerFired(Timer<MainThreadTaskRunner>*)
+void MainThreadTaskRunner::pendingTasksTimerFired(TimerBase*)
 {
     // If the owner m_context is about to be swept then it
     // is no longer safe to access.
     if (ThreadHeap::willObjectBeLazilySwept(m_context.get()))
         return;
 
     while (!m_pendingTasks.isEmpty()) {
         std::unique_ptr<ExecutionContextTask> task = std::move(m_pendingTasks[0].first);
         const bool instrumenting = m_pendingTasks[0].second;
         m_pendingTasks.remove(0);
         InspectorInstrumentation::AsyncTask asyncTask(m_context, task.get(), instrumenting);
         task->performTask(m_context);
     }
 }
 
 } // namespace blink