Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/modules/peerconnection/RTCDTMFSender.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCDTMFSender.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCDTMFSender.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCDTMFSender.cpp
index 7bee3e0c2f7201ab8e8173c777ed2eeb1a6f78cd..c7d7fd5d1531ac8eaa828bf7fa814c92bdb3aed7 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCDTMFSender.cpp
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCDTMFSender.cpp
@@ -161,7 +161,7 @@ void RTCDTMFSender::scheduleDispatchEvent(Event* event)
         m_scheduledEventTimer.startOneShot(0, BLINK_FROM_HERE);
 }
 
-void RTCDTMFSender::scheduledEventTimerFired(Timer<RTCDTMFSender>*)
+void RTCDTMFSender::scheduledEventTimerFired(TimerBase*)
 {
     if (m_stopped)
         return;