Remove unnecessary add/removeObserver lifetime notifier indirections.

Source/core/dom/ContextLifecycleNotifier.cpp

Index: Source/core/dom/ContextLifecycleNotifier.cpp
diff --git a/Source/core/dom/ContextLifecycleNotifier.cpp b/Source/core/dom/ContextLifecycleNotifier.cpp
index 131bdbc1e0673a5a313778b5d204c2e031e025e1..1f9a37f46df2d9eff2097e39763eb385355d72ea 100644
--- a/Source/core/dom/ContextLifecycleNotifier.cpp
+++ b/Source/core/dom/ContextLifecycleNotifier.cpp
@@ -45,11 +45,6 @@ void ContextLifecycleNotifier::addObserver(ContextLifecycleObserver* observer)
         RELEASE_ASSERT(m_iterating != IteratingOverActiveDOMObjects);
 }
 
-void ContextLifecycleNotifier::removeObserver(ContextLifecycleObserver* observer)
-{
-    LifecycleNotifier<ExecutionContext, ContextLifecycleObserver>::removeObserver(observer);
-}
-
 void ContextLifecycleNotifier::notifyResumingActiveDOMObjects()
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverActiveDOMObjects);