Remove unnecessary add/removeObserver lifetime notifier indirections.

Source/platform/LifecycleNotifier.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * 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 24 matching lines @@
 namespace blink {
 
 template<typename T, typename Observer>
 class LifecycleNotifier {
 public:
     typedef T Context;
 
     virtual ~LifecycleNotifier();
     virtual bool isContextThread() const { return true; }
 
+    void addObserver(Observer*);
+    void removeObserver(Observer*);
+
     // notifyContextDestroyed() should be explicitly dispatched from an
     // observed context to notify observers that contextDestroyed().
     //
     // When contextDestroyed() is called, m_context is still
     // valid and safe to use m_context during the notification.
     virtual void notifyContextDestroyed();
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
     bool isIteratingOverObservers() const { return m_iterating != IteratingNone; }
 
 protected:
     explicit LifecycleNotifier(Context* context)
         : m_iterating(IteratingNone)
         , m_context(context)
         , m_didCallContextDestroyed(false)
     {
     }
 
-    void addObserver(Observer*);
-    void removeObserver(Observer*);
-
     Context* context() const { return m_context; }
 
     enum IterationType {
         IteratingNone,
         IteratingOverAll,
         IteratingOverActiveDOMObjects,
     };
 
     IterationType m_iterating;
 
@@ skipping 55 matching lines @@
 
 template<typename T, typename Observer>
 inline void LifecycleNotifier<T, Observer>::removeObserver(Observer* observer)
 {
     m_observers.remove(observer);
 }
 
 } // namespace blink
 
 #endif // LifecycleNotifier_h