Remove unnecessary add/removeObserver lifetime notifier indirections.

Source/platform/LifecycleNotifier.h

Index: Source/platform/LifecycleNotifier.h
diff --git a/Source/platform/LifecycleNotifier.h b/Source/platform/LifecycleNotifier.h
index 16659d52a8e130784203d3e0b9b2d3a058da9124..c256694dfba92484ce5d006beacc332a09a86d42 100644
--- a/Source/platform/LifecycleNotifier.h
+++ b/Source/platform/LifecycleNotifier.h
@@ -42,6 +42,9 @@ public:
     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().
     //
@@ -61,9 +64,6 @@ protected:
     {
     }
 
-    void addObserver(Observer*);
-    void removeObserver(Observer*);
-
     Context* context() const { return m_context; }
 
     enum IterationType {