Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.h

 /*
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 103 matching lines @@
     void didDecreaseBufferedAmount(unsigned) override;
     void didReceiveStringData(const WebString&) override;
     void didReceiveRawData(const char*, size_t) override;
     void didDetectError() override;
 
 private:
     RTCDataChannel(ExecutionContext*, std::unique_ptr<WebRTCDataChannelHandler>);
     void dispose();
 
     void scheduleDispatchEvent(Event*);
-    void scheduledEventTimerFired(Timer<RTCDataChannel>*);
+    void scheduledEventTimerFired(TimerBase*);
 
     std::unique_ptr<WebRTCDataChannelHandler> m_handler;
 
     WebRTCDataChannelHandlerClient::ReadyState m_readyState;
 
     enum BinaryType {
         BinaryTypeBlob,
         BinaryTypeArrayBuffer
     };
     BinaryType m_binaryType;
 
     Timer<RTCDataChannel> m_scheduledEventTimer;
     HeapVector<Member<Event>> m_scheduledEvents;
 
     unsigned m_bufferedAmountLowThreshold;
 
     bool m_stopped;
 
     FRIEND_TEST_ALL_PREFIXES(RTCDataChannelTest, BufferedAmountLow);
 };
 
 } // namespace blink
 
 #endif // RTCDataChannel_h