Drop unbound ExecutionContext::createLifecycleNotifier() declaration.

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 99 matching lines @@
     // Called after the construction of an ActiveDOMObject to synchronize suspend state.
     void suspendActiveDOMObjectIfNeeded(ActiveDOMObject*);
 #if !ENABLE(OILPAN)
     void ref() { refExecutionContext(); }
     void deref() { derefExecutionContext(); }
 #endif
 
     // Gets the next id in a circular sequence from 1 to 2^31-1.
     int circularSequentialID();
 
-    PassOwnPtr<LifecycleNotifier<ExecutionContext> > createLifecycleNotifier();
-
     virtual EventTarget* errorEventTarget() = 0;
     virtual EventQueue* eventQueue() const = 0;
 
     void enforceStrictMixedContentChecking() { m_strictMixedContentCheckingEnforced = true; }
     bool shouldEnforceStrictMixedContentChecking() const { return m_strictMixedContentCheckingEnforced; }
 
     // Methods related to window interaction. It should be used to manage window
     // focusing and window creation permission for an ExecutionContext.
     void allowWindowInteraction();
     void consumeWindowInteraction();
@@ skipping 35 matching lines @@
     // Counter that keeps track of how many window interaction calls are allowed
     // for this ExecutionContext. Callers are expected to call
     // |allowWindowInteraction()| and |consumeWindowInteraction()| in order to
     // increment and decrement the counter.
     int m_windowInteractionTokens;
 };
 
 } // namespace blink
 
 #endif // ExecutionContext_h