Simplify lifecycle notifiers and observers.

Source/core/frame/DOMWindowLifecycleObserver.cpp

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 
 #include "config.h"
 #include "core/frame/DOMWindowLifecycleObserver.h"
 
 #include "core/frame/DOMWindowLifecycleNotifier.h"
 #include "core/frame/LocalDOMWindow.h"
 
 namespace blink {
 
-template<> void observeContext(LocalDOMWindow* context, LifecycleObserver<LocalDOMWindow>* observer)
+DOMWindowLifecycleObserver::DOMWindowLifecycleObserver(LocalDOMWindow* window)
+    : LifecycleObserver<LocalDOMWindow, DOMWindowLifecycleObserver, DOMWindowLifecycleNotifier>(window)
 {
-    context->addObserver(observer);
-}
-
-template<> void unobserveContext(LocalDOMWindow* context, LifecycleObserver<LocalDOMWindow>* observer)
-{
-    context->removeObserver(observer);
-}
-
-DOMWindowLifecycleObserver::DOMWindowLifecycleObserver(LocalDOMWindow* window)
-    : LifecycleObserver<LocalDOMWindow>(window, DOMWindowLifecycleObserverType)
-{
+    setContext(window);
 }
 
 DOMWindowLifecycleObserver::~DOMWindowLifecycleObserver()
 {
 }
 
 } // namespace blink