Eagerly sweep MediaKeySession objects.

Source/modules/encryptedmedia/MediaKeySession.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 71 matching lines @@
     ScriptPromise remove(ScriptState*);
 
     // EventTarget
     virtual const AtomicString& interfaceName() const override;
     virtual ExecutionContext* executionContext() const override;
 
     // ActiveDOMObject
     virtual bool hasPendingActivity() const override;
     virtual void stop() override;
 
+    EAGERLY_SWEEP();
     DECLARE_VIRTUAL_TRACE();
 
 private:
     class PendingAction;
     friend class NewSessionResultPromise;
     friend class LoadSessionResultPromise;
 
     MediaKeySession(ScriptState*, MediaKeys*, WebEncryptedMediaSessionType);
 
     void actionTimerFired(Timer<MediaKeySession>*);
@@ skipping 30 matching lines @@
     typedef ScriptPromiseProperty<Member<MediaKeySession>, ToV8UndefinedGenerator, Member<DOMException>> ClosedPromise;
     Member<ClosedPromise> m_closedPromise;
 
     HeapDeque<Member<PendingAction>> m_pendingActions;
     Timer<MediaKeySession> m_actionTimer;
 };
 
 } // namespace blink
 
 #endif // MediaKeySession_h