Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/core/dom/MessagePort.cpp

 /*
  * Copyright (C) 2008 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 258 matching lines @@
         MessagePort* port = MessagePort::create(context);
         port->entangle((*channels)[i].release());
         (*portArray)[i] = port;
     }
     return portArray;
 }
 
 DEFINE_TRACE(MessagePort)
 {
     ActiveDOMObject::trace(visitor);
-    EventTargetWithInlineData::trace(visitor);
+    RefCountedGarbageCollectedEventTargetWithInlineData<MessagePort>::trace(visitor);
 }
 
 v8::Isolate* MessagePort::scriptIsolate()
 {
     ASSERT(executionContext());
     return toIsolate(executionContext());
 }
 
 v8::Local<v8::Context> MessagePort::scriptContextForMessageConversion()
 {
     ASSERT(executionContext());
     if (!m_scriptStateForConversion) {
         v8::Isolate* isolate = scriptIsolate();
         m_scriptStateForConversion = ScriptState::create(v8::Context::New(isolate), DOMWrapperWorld::create(isolate));
     }
     return m_scriptStateForConversion->context();
 }
 
 } // namespace blink