Extract simpler classes for observing context lifecycle and observe Page lifecycle inNavigatorVibra…

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 22c3ffb5c9ebb5af0b4a6986b81d6b3ef0dbcc82..976989421db812557a42dda73ef5c0243cc618dd 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5240,7 +5240,7 @@ void Document::didAssociateFormControlsTimerFired(Timer<Document>* timer)
     m_associatedFormControls.clear();
 }
 
-PassOwnPtr<ContextLifecycleNotifier> Document::createLifecycleNotifier()
+PassOwnPtr<LifecycleNotifier> Document::createLifecycleNotifier()
 {
     return DocumentLifecycleNotifier::create(this);
 }