Remove unnecessary add/removeObserver lifetime notifier indirections.

Source/core/page/PageLifecycleNotifier.cpp

Index: Source/core/page/PageLifecycleNotifier.cpp
diff --git a/Source/core/page/PageLifecycleNotifier.cpp b/Source/core/page/PageLifecycleNotifier.cpp
index 134676b30ed8f0be5b9e7ff4518e4d6673b80807..a823119321e4ab06ffdca81105f982f8b90fb6ec 100644
--- a/Source/core/page/PageLifecycleNotifier.cpp
+++ b/Source/core/page/PageLifecycleNotifier.cpp
@@ -36,16 +36,6 @@ PageLifecycleNotifier::PageLifecycleNotifier(Page* context)
 {
 }
 
-void PageLifecycleNotifier::addObserver(PageLifecycleObserver* observer)
-{
-    LifecycleNotifier<Page, PageLifecycleObserver>::addObserver(observer);
-}
-
-void PageLifecycleNotifier::removeObserver(PageLifecycleObserver* observer)
-{
-    LifecycleNotifier<Page, PageLifecycleObserver>::removeObserver(observer);
-}
-
 void PageLifecycleNotifier::notifyPageVisibilityChanged()
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);