Simplify LifecycleNotifier and Observer.

third_party/WebKit/Source/core/dom/Fullscreen.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 175 matching lines @@
     return lifecycleContext();
 }
 
 void Fullscreen::documentWasDetached()
 {
     m_eventQueue.clear();
 
     if (m_fullScreenLayoutObject)
         m_fullScreenLayoutObject->destroy();
 
-#if ENABLE(OILPAN)
     m_fullScreenElement = nullptr;
     m_fullScreenElementStack.clear();
-#endif
 
 }
 
-#if !ENABLE(OILPAN)
-void Fullscreen::documentWasDisposed()
-{
-    // NOTE: the context dispose phase is not supported in oilpan. Please
-    // consider using the detach phase instead.
-    m_fullScreenElement = nullptr;
-    m_fullScreenElementStack.clear();
-}
-#endif
-
 void Fullscreen::requestFullscreen(Element& element, RequestType requestType)
 {
     if (document()->isSecureContext()) {
         UseCounter::count(document(), UseCounter::FullscreenSecureOrigin);
     } else {
         UseCounter::count(document(), UseCounter::FullscreenInsecureOrigin);
         OriginsUsingFeatures::countAnyWorld(*document(), OriginsUsingFeatures::Feature::FullscreenInsecureOrigin);
     }
 
     // Ignore this request if the document is not in a live frame.
@@ skipping 402 matching lines @@
 #if ENABLE(OILPAN)
     visitor->trace(m_fullScreenElement);
     visitor->trace(m_fullScreenElementStack);
     visitor->trace(m_eventQueue);
 #endif
     Supplement<Document>::trace(visitor);
     DocumentLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink