Oilpan: move MessageChannel to the heap.

Source/core/dom/MessageChannel.h

 /*
  * 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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 #ifndef MessageChannel_h
 #define MessageChannel_h
 
 #include "bindings/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class MessagePort;
 class ExecutionContext;
 
-class MessageChannel : public RefCounted<MessageChannel>, public ScriptWrappable {
+class MessageChannel FINAL : public RefCountedWillBeGarbageCollectedFinalized<MessageChannel>, public ScriptWrappable {
 public:
-    static PassRefPtr<MessageChannel> create(ExecutionContext* context) { return adoptRef(new MessageChannel(context)); }
+    static PassRefPtrWillBeRawPtr<MessageChannel> create(ExecutionContext* context)
+    {
+        return adoptRefWillBeNoop(new MessageChannel(context));
+    }
     ~MessageChannel();
 
     MessagePort* port1() const { return m_port1.get(); }
     MessagePort* port2() const { return m_port2.get(); }
 
+    void trace(Visitor*);
+
 private:
     explicit MessageChannel(ExecutionContext*);
 
-    RefPtr<MessagePort> m_port1;
-    RefPtr<MessagePort> m_port2;
+    RefPtrWillBeMember<MessagePort> m_port1;
+    RefPtrWillBeMember<MessagePort> m_port2;
 };
 
 } // namespace WebCore
 
 #endif // MessageChannel_h