Move MediaKeys timer to frame-specific TaskRunnerTimer.

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 110 matching lines @@
   // 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;
+  TaskRunnerTimer<MediaKeys> m_timer;
 };
 
 }  // namespace blink
 
 #endif  // MediaKeys_h