Let FullscreenElementStack methods take references where possible

Source/core/dom/FullscreenElementStack.h

 /*
  * 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 38 matching lines @@
     , public DocumentLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(FullscreenElementStack);
 public:
     virtual ~FullscreenElementStack();
     static const char* supplementName();
     static FullscreenElementStack& from(Document&);
     static FullscreenElementStack* fromIfExists(Document&);
     static Element* fullscreenElementFrom(Document&);
     static Element* currentFullScreenElementFrom(Document&);
     static bool isFullScreen(Document&);
-    static bool isActiveFullScreenElement(const Element*);
+    static bool isActiveFullScreenElement(const Element&);
 
     enum FullScreenCheckType {
         EnforceIFrameAllowFullScreenRequirement,
         ExemptIFrameAllowFullScreenRequirement,
     };
 
-    void requestFullScreenForElement(Element*, unsigned short flags, FullScreenCheckType);
+    void requestFullScreenForElement(Element&, unsigned short flags, FullScreenCheckType);
     void webkitCancelFullScreen();
 
     void webkitWillEnterFullScreenForElement(Element*);
     void webkitDidEnterFullScreenForElement(Element*);
     void webkitWillExitFullScreenForElement(Element*);
     void webkitDidExitFullScreenForElement(Element*);
 
     void setFullScreenRenderer(RenderFullScreen*);
     RenderFullScreen* fullScreenRenderer() const { return m_fullScreenRenderer; }
     void fullScreenRendererDestroyed();
 
     void clearFullscreenElementStack();
     void popFullscreenElementStack();
-    void pushFullscreenElementStack(Element*);
-    void addDocumentToFullScreenChangeEventQueue(Document*);
+    void pushFullscreenElementStack(Element&);
+    void addDocumentToFullScreenChangeEventQueue(Document&);
 
-    bool fullScreenIsAllowedForElement(Element*) const;
     void fullScreenElementRemoved();
     void removeFullScreenElementOfSubtree(Node*, bool amongChildrenOnly = false);
 
     // W3C API
     static bool webkitFullscreenEnabled(Document&);
     Element* webkitFullscreenElement() const { return !m_fullScreenElementStack.isEmpty() ? m_fullScreenElementStack.last().get() : 0; }
     void webkitExitFullscreen();
 
     bool webkitIsFullScreen() const { return m_fullScreenElement.get(); }
     bool webkitFullScreenKeyboardInputAllowed() const { return m_fullScreenElement.get() && m_areKeysEnabledInFullScreen; }
@@ skipping 18 matching lines @@
     RefPtrWillBeMember<Element> m_fullScreenElement;
     WillBeHeapVector<RefPtrWillBeMember<Element> > m_fullScreenElementStack;
     RenderFullScreen* m_fullScreenRenderer;
     Timer<FullscreenElementStack> m_fullScreenChangeDelayTimer;
     WillBeHeapDeque<RefPtrWillBeMember<Node> > m_fullScreenChangeEventTargetQueue;
     WillBeHeapDeque<RefPtrWillBeMember<Node> > m_fullScreenErrorEventTargetQueue;
     LayoutRect m_savedPlaceholderFrameRect;
     RefPtr<RenderStyle> m_savedPlaceholderRenderStyle;
 };
 
-inline bool FullscreenElementStack::isActiveFullScreenElement(const Element* element)
+inline bool FullscreenElementStack::isActiveFullScreenElement(const Element& element)
 {
-    FullscreenElementStack* controller = fromIfExists(element->document());
+    FullscreenElementStack* controller = fromIfExists(element.document());
     if (!controller)
         return false;
     return controller->webkitIsFullScreen() && controller->webkitCurrentFullScreenElement() == element;
 }
 
 inline FullscreenElementStack* FullscreenElementStack::fromIfExists(Document& document)
 {
     if (!document.hasFullscreenElementStack())
         return 0;
     return fromIfExistsSlow(document);
 }
 
 } // namespace WebCore
 
 #endif // FullscreenElementStack_h