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

Source/core/dom/ExecutionContext.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2012 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 130 matching lines @@
     bool isWindowFocusAllowed() const;
 
 protected:
     ExecutionContext();
     virtual ~ExecutionContext();
 
     virtual const KURL& virtualURL() const = 0;
     virtual KURL virtualCompleteURL(const String&) const = 0;
 
     ContextLifecycleNotifier& lifecycleNotifier();
+    void contextDestroyed()
+    {
+        LifecycleContext<ExecutionContext>::contextDestroyed();
+    }
 
 private:
     friend class DOMTimer; // For installNewTimeout() and removeTimeoutByID() below.
 
     bool dispatchErrorEvent(PassRefPtrWillBeRawPtr<ErrorEvent>, AccessControlStatus);
 
 #if !ENABLE(OILPAN)
     virtual void refExecutionContext() = 0;
     virtual void derefExecutionContext() = 0;
 #endif
@@ skipping 29 matching lines @@
     // Counter that keeps track of how many window focus calls are allowed for
     // this ExecutionContext. Callers are expected to call |allowWindowFocus()|
     // and |consumeWindowFocus()| in order to increment and decrement the
     // counter.
     int m_windowFocusTokens;
 };
 
 } // namespace blink
 
 #endif // ExecutionContext_h