Oilpan: Remove raw pointer to ExecutionContext from WorkerInspectorProxy

Source/core/workers/WorkerMessagingProxy.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Google 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
@@ skipping 78 matching lines @@
     m_workerInspectorProxy->setWorkerGlobalScopeProxy(this);
 }
 
 WorkerMessagingProxy::~WorkerMessagingProxy()
 {
     ASSERT(!m_workerObject);
     ASSERT((m_executionContext->isDocument() && isMainThread())
         || (m_executionContext->isWorkerGlobalScope() && toWorkerGlobalScope(m_executionContext.get())->thread()->isCurrentThread()));
     if (m_loaderProxy)
         m_loaderProxy->detachProvider(this);
+    m_workerInspectorProxy->setWorkerGlobalScopeProxy(nullptr);
 }
 
 void WorkerMessagingProxy::startWorkerGlobalScope(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode startMode)
 {
     // FIXME: This need to be revisited when we support nested worker one day
     ASSERT(m_executionContext->isDocument());
     if (m_askedToTerminate) {
         // Worker.terminate() could be called from JS before the thread was created.
         return;
     }
@@ skipping 186 matching lines @@
 
     // FIXME: This need to be revisited when we support nested worker one day
     ASSERT(m_executionContext->isDocument());
     Document* document = toDocument(m_executionContext.get());
     LocalFrame* frame = document->frame();
     if (frame)
         frame->console().adoptWorkerMessagesAfterTermination(this);
 }
 
 } // namespace blink