LifecycleObserver::contextDestroyed should be explicitly dispatched promptly when a context is dest…

Source/core/workers/WorkerGlobalScope.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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 196 matching lines @@
 
     m_eventQueue->close();
     clearScript();
     clearInspector();
     // We do not clear the thread field of the
     // WorkerGlobalScope. Other objects keep the worker global scope
     // alive because they need its thread field to check that work is
     // being carried out on the right thread. We therefore cannot clear
     // the thread field before all references to the worker global
     // scope are gone.
+
+    ExecutionContext::contextDestroyed();
 }
 
 void WorkerGlobalScope::didEvaluateWorkerScript()
 {
 }
 
 void WorkerGlobalScope::importScripts(const Vector<String>& urls, ExceptionState& exceptionState)
 {
     ASSERT(contentSecurityPolicy());
     ASSERT(executionContext());
@@ skipping 126 matching lines @@
     visitor->trace(m_workerClients);
     visitor->trace(m_messageStorage);
     visitor->trace(m_pendingMessages);
     HeapSupplementable<WorkerGlobalScope>::trace(visitor);
 #endif
     ExecutionContext::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink