InlinedVisitor: Migrate encryptedmedia to use inlined tracing

Source/modules/encryptedmedia/MediaKeyMessageEvent.h

 /*
  * Copyright (C) 2012 Google Inc.  All rights reserved.
  * 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
@@ skipping 37 matching lines @@
     static PassRefPtrWillBeRawPtr<MediaKeyMessageEvent> create(const AtomicString& type, const MediaKeyMessageEventInit& initializer)
     {
         return adoptRefWillBeNoop(new MediaKeyMessageEvent(type, initializer));
     }
 
     virtual const AtomicString& interfaceName() const override;
 
     String messageType() const { return m_messageType; }
     DOMArrayBuffer* message() const { return m_message.get(); }
 
-    virtual void trace(Visitor*) override;
+    DECLARE_VIRTUAL_TRACE();
 
 private:
     MediaKeyMessageEvent();
     MediaKeyMessageEvent(const AtomicString& type, const MediaKeyMessageEventInit& initializer);
 
     String m_messageType;
     RefPtr<DOMArrayBuffer> m_message;
 };
 
 } // namespace blink
 
 #endif // MediaKeyMessageEvent_h