Simplify lifecycle notifiers and observers.

Source/core/frame/DOMWindowLifecycleObserver.h

 
 /*
  * Copyright (C) 2013 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 15 matching lines @@
 
 #ifndef DOMWindowLifecycleObserver_h
 #define DOMWindowLifecycleObserver_h
 
 #include "core/frame/LocalDOMWindow.h"
 #include "platform/LifecycleObserver.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-template<> void observeContext(LocalDOMWindow*, LifecycleObserver<LocalDOMWindow>*);
-template<> void unobserveContext(LocalDOMWindow*, LifecycleObserver<LocalDOMWindow>*);
+class DOMWindowLifecycleNotifier;
 
-class DOMWindowLifecycleObserver : public LifecycleObserver<LocalDOMWindow> {
+class DOMWindowLifecycleObserver : public LifecycleObserver<LocalDOMWindow, DOMWindowLifecycleObserver, DOMWindowLifecycleNotifier> {
 public:
-    explicit DOMWindowLifecycleObserver(LocalDOMWindow*);
-    virtual ~DOMWindowLifecycleObserver();
-
     virtual void contextDestroyed()
     {
         didRemoveAllEventListeners(lifecycleContext());
-        LifecycleObserver<LocalDOMWindow>::contextDestroyed();
+        LifecycleObserver<LocalDOMWindow, DOMWindowLifecycleObserver, DOMWindowLifecycleNotifier>::contextDestroyed();
     }
     virtual void didAddEventListener(LocalDOMWindow*, const AtomicString&) { }
     virtual void didRemoveEventListener(LocalDOMWindow*, const AtomicString&) { }
     virtual void didRemoveAllEventListeners(LocalDOMWindow*) { }
+
+protected:
+    explicit DOMWindowLifecycleObserver(LocalDOMWindow*);
+    virtual ~DOMWindowLifecycleObserver();
 };
 
 } // namespace blink
 
 #endif // DOMWindowLifecycleObserver_h