Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/modules/encryptedmedia/MediaKeys.h

 /*
  * Copyright (C) 2013 Apple 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 78 matching lines @@
     void stop() override;
 
     // ActiveScriptWrappable implementation.
     bool hasPendingActivity() const final;
 
 private:
     MediaKeys(ExecutionContext*, const WebVector<WebEncryptedMediaSessionType>& supportedSessionTypes, std::unique_ptr<WebContentDecryptionModule>);
     class PendingAction;
 
     bool sessionTypeSupported(WebEncryptedMediaSessionType);
-    void timerFired(Timer<MediaKeys>*);
+    void timerFired(TimerBase*);
 
     const WebVector<WebEncryptedMediaSessionType> m_supportedSessionTypes;
     std::unique_ptr<WebContentDecryptionModule> m_cdm;
 
     // Keep track of the HTMLMediaElement that references this object. Keeping
     // a WeakMember so that HTMLMediaElement's lifetime isn't dependent on
     // this object.
     // Note that the referenced HTMLMediaElement must be destroyed
     // before this object. This is due to WebMediaPlayerImpl (owned by
     // HTMLMediaElement) possibly having a pointer to Decryptor created
     // by WebContentDecryptionModuleImpl (owned by this object).
     WeakMember<HTMLMediaElement> m_mediaElement;
 
     // Keep track of whether this object has been reserved by HTMLMediaElement
     // (i.e. a setMediaKeys operation is in progress). Destruction of this
     // object will be prevented until the setMediaKeys() completes.
     bool m_reservedForMediaElement;
 
     HeapDeque<Member<PendingAction>> m_pendingActions;
     Timer<MediaKeys> m_timer;
 };
 
 } // namespace blink
 
 #endif // MediaKeys_h