Oilpan: Allocate all EventTarget derived types on the manged 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 26 matching lines @@
 #include "core/frame/DOMWindow.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "public/platform/WebString.h"
 #include "wtf/Functional.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 PassRefPtr<MessagePort> MessagePort::create(ExecutionContext& executionContext)
 {
-    RefPtr<MessagePort> port = adoptRef(new MessagePort(executionContext));
+    RefPtrWillBeRawPtr<MessagePort> port = adoptRefWillBeRefCountedGarbageCollected(new MessagePort(executionContext));
     port->suspendIfNeeded();
     return port.release();
 }
 
 MessagePort::MessagePort(ExecutionContext& executionContext)
     : ActiveDOMObject(&executionContext)
     , m_started(false)
     , m_closed(false)
     , m_weakFactory(this)
 {
@@ skipping 192 matching lines @@
     OwnPtr<MessagePortArray> portArray = adoptPtr(new MessagePortArray(channels->size()));
     for (unsigned i = 0; i < channels->size(); ++i) {
         RefPtr<MessagePort> port = MessagePort::create(context);
         port->entangle((*channels)[i].release());
         (*portArray)[i] = port.release();
     }
     return portArray.release();
 }
 
 } // namespace WebCore