Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

Source/modules/encryptedmedia/MediaKeys.cpp

 /*
  * 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 21 matching lines @@
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/html/HTMLMediaElement.h"
 #include "modules/encryptedmedia/MediaKeyMessageEvent.h"
 #include "platform/Logging.h"
 #include "platform/UUID.h"
 #include "platform/drm/ContentDecryptionModule.h"
 #include "wtf/HashSet.h"
 
 namespace WebCore {
 
-DEFINE_GC_INFO(MediaKeys);
-
 PassRefPtrWillBeRawPtr<MediaKeys> MediaKeys::create(ExecutionContext* context, const String& keySystem, ExceptionState& exceptionState)
 {
     // From <http://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#dom-media-keys-constructor>:
     // The MediaKeys(keySystem) constructor must run the following steps:
 
     // 1. If keySystem is null or an empty string, throw an InvalidAccessError exception and abort these steps.
     if (keySystem.isEmpty()) {
         exceptionState.throwDOMException(InvalidAccessError, "The key system provided is invalid.");
         return nullptr;
     }
@@ skipping 113 matching lines @@
 
 void MediaKeys::contextDestroyed()
 {
     ContextLifecycleObserver::contextDestroyed();
 
     // We don't need the CDM anymore.
     m_cdm.clear();
 }
 
 }