Rename ContextDestructionObserver to ContextLifecycleObserver

Source/core/dom/ScriptExecutionContext.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 75 matching lines @@
     virtual void suspendActiveDOMObjects(ActiveDOMObject::ReasonForSuspension);
     virtual void resumeActiveDOMObjects();
     virtual void stopActiveDOMObjects();
 
     bool activeDOMObjectsAreSuspended() const { return m_activeDOMObjectsAreSuspended; }
     bool activeDOMObjectsAreStopped() const { return m_activeDOMObjectsAreStopped; }
 
     // Called after the construction of an ActiveDOMObject to synchronize suspend state.
     void suspendActiveDOMObjectIfNeeded(ActiveDOMObject*);
 
-    // Called from the constructor and destructors of ContextDestructionObserver
-    void wasObservedBy(ContextDestructionObserver*, ContextDestructionObserver::Type as);
-    void wasUnobservedBy(ContextDestructionObserver*, ContextDestructionObserver::Type as);
+    // Called from the constructor and destructors of ContextLifecycleObserver
+    void wasObservedBy(ContextLifecycleObserver*, ContextLifecycleObserver::Type as);
+    void wasUnobservedBy(ContextLifecycleObserver*, ContextLifecycleObserver::Type as);
 
     // MessagePort is conceptually a kind of ActiveDOMObject, but it needs to be tracked separately for message dispatch.
     void processMessagePortMessagesSoon();
     void dispatchMessagePortEvents();
     void createdMessagePort(MessagePort*);
     void destroyedMessagePort(MessagePort*);
     const HashSet<MessagePort*>& messagePorts() const { return m_messagePorts; }
 
     void ref() { refScriptExecutionContext(); }
     void deref() { derefScriptExecutionContext(); }
@@ skipping 80 matching lines @@
     bool m_activeDOMObjectsAreStopped;
 
     OwnPtr<PublicURLManager> m_publicURLManager;
 
     RefPtr<DatabaseContext> m_databaseContext;
 };
 
 } // namespace WebCore
 
 #endif // ScriptExecutionContext_h