Remove ActiveScriptWrappableBase::m_scriptWrappable

third_party/WebKit/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 33 matching lines @@
 
 namespace blink {
 
 MessagePort* MessagePort::create(ExecutionContext& executionContext) {
   MessagePort* port = new MessagePort(executionContext);
   port->suspendIfNeeded();
   return port;
 }
 
 MessagePort::MessagePort(ExecutionContext& executionContext)
-    : ActiveScriptWrappable(this),
+    : ActiveScriptWrappable(),

[sof, 2016/12/16 06:36:23]

It could be tedious change to make, but just remove all calls to the default
constructor?

       SuspendableObject(&executionContext),
       m_started(false),
       m_closed(false) {}
 
 MessagePort::~MessagePort() {
   DCHECK(!m_started || !isEntangled());
 }
 
 void MessagePort::postMessage(ExecutionContext* context,
                               PassRefPtr<SerializedScriptValue> message,
@@ skipping 224 matching lines @@
   }
   return portArray;
 }
 
 DEFINE_TRACE(MessagePort) {
   SuspendableObject::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink