Revert of Reduce ActiveDOMObjects from core/

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 27 matching lines @@
 #include "core/inspector/ConsoleMessage.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "public/platform/WebString.h"
 #include "wtf/Functional.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 MessagePort* MessagePort::create(ExecutionContext& executionContext)
 {
-    return new MessagePort(executionContext);
+    MessagePort* port = new MessagePort(executionContext);
+    port->suspendIfNeeded();
+    return port;
 }
 
 MessagePort::MessagePort(ExecutionContext& executionContext)
-    : ContextLifecycleObserver(&executionContext)
+    : ActiveDOMObject(&executionContext)
     , m_started(false)
     , m_closed(false)
     , m_weakFactory(this)
 {
 }
 
 MessagePort::~MessagePort()
 {
     close();
     if (m_scriptStateForConversion)
@@ skipping 206 matching lines @@
     for (unsigned i = 0; i < channels->size(); ++i) {
         MessagePort* port = MessagePort::create(context);
         port->entangle((*channels)[i].release());
         (*portArray)[i] = port;
     }
     return portArray;
 }
 
 DEFINE_TRACE(MessagePort)
 {
-    ContextLifecycleObserver::trace(visitor);
+    ActiveDOMObject::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