Have LifecycleContext::lifecycleNotifier() return a reference

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 541 matching lines @@
     if (m_visibilityState == visibilityState)
         return;
     m_visibilityState = visibilityState;
 
     if (visibilityState == WebCore::PageVisibilityStateHidden)
         setTimerAlignmentInterval(DOMTimer::hiddenPageAlignmentInterval());
     else
         setTimerAlignmentInterval(DOMTimer::visiblePageAlignmentInterval());
 
     if (!isInitialState)
-        lifecycleNotifier()->notifyPageVisibilityChanged();
+        lifecycleNotifier().notifyPageVisibilityChanged();
 
     if (!isInitialState && m_mainFrame)
         m_mainFrame->dispatchVisibilityStateChangeEvent();
 }
 
 PageVisibilityState Page::visibilityState() const
 {
     return m_visibilityState;
 }
 
 void Page::addMultisamplingChangedObserver(MultisamplingChangedObserver* observer)
 {
     m_multisamplingChangedObservers.add(observer);
 }
 
 void Page::removeMultisamplingChangedObserver(MultisamplingChangedObserver* observer)
 {
     m_multisamplingChangedObservers.remove(observer);
 }
 
 void Page::multisamplingChanged()
 {
     HashSet<MultisamplingChangedObserver*>::iterator stop = m_multisamplingChangedObservers.end();
     for (HashSet<MultisamplingChangedObserver*>::iterator it = m_multisamplingChangedObservers.begin(); it != stop; ++it)
         (*it)->multisamplingChanged(m_settings->openGLMultisamplingEnabled());
 }
 
 void Page::didCommitLoad(Frame* frame)
 {
-    lifecycleNotifier()->notifyDidCommitLoad(frame);
+    lifecycleNotifier().notifyDidCommitLoad(frame);
     if (m_mainFrame == frame)
         useCounter().didCommitLoad();
 }
 
-PageLifecycleNotifier* Page::lifecycleNotifier()
+PageLifecycleNotifier& Page::lifecycleNotifier()
 {
-    return static_cast<PageLifecycleNotifier*>(LifecycleContext::lifecycleNotifier());
+    return static_cast<PageLifecycleNotifier&>(LifecycleContext::lifecycleNotifier());
 }
 
 PassOwnPtr<LifecycleNotifier<Page> > Page::createLifecycleNotifier()
 {
     return PageLifecycleNotifier::create(this);
 }
 
 Page::PageClients::PageClients()
     : chromeClient(0)
     , contextMenuClient(0)
     , editorClient(0)
     , dragClient(0)
     , inspectorClient(0)
     , backForwardClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace WebCore