Let FullscreenElementStack methods take references where possible

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2648 matching lines @@
     return parseToDoubleForNumberType(getAttribute(attributeName), fallbackValue);
 }
 
 void Element::setFloatingPointAttribute(const QualifiedName& attributeName, double value)
 {
     setAttribute(attributeName, AtomicString::number(value));
 }
 
 void Element::webkitRequestFullscreen()
 {
-    FullscreenElementStack::from(document()).requestFullScreenForElement(this, ALLOW_KEYBOARD_INPUT, FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
+    FullscreenElementStack::from(document()).requestFullScreenForElement(*this, ALLOW_KEYBOARD_INPUT, FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
 }
 
 void Element::webkitRequestFullScreen(unsigned short flags)
 {
-    FullscreenElementStack::from(document()).requestFullScreenForElement(this, (flags | LEGACY_MOZILLA_REQUEST), FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
+    FullscreenElementStack::from(document()).requestFullScreenForElement(*this, (flags | LEGACY_MOZILLA_REQUEST), FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
 }
 
 void Element::setContainsFullScreenElement(bool flag)
 {
     setElementFlag(ContainsFullScreenElement, flag);
     setNeedsStyleRecalc(SubtreeStyleChange);
 }
 
 static Element* parentCrossingFrameBoundaries(Element* element)
 {
@@ skipping 625 matching lines @@
         return false;
     // Turn off style sharing for elements that can gain layers for reasons outside of the style system.
     // See comments in RenderObject::setStyle().
     // FIXME: Why does gaining a layer from outside the style system require disabling sharing?
     if (isHTMLFrameElementBase(*this)
         || isHTMLEmbedElement(*this)
         || isHTMLObjectElement(*this)
         || isHTMLAppletElement(*this)
         || isHTMLCanvasElement(*this))
         return false;
-    if (FullscreenElementStack::isActiveFullScreenElement(this))
+    if (FullscreenElementStack::isActiveFullScreenElement(*this))
         return false;
     return true;
 }
 
 void Element::trace(Visitor* visitor)
 {
     if (hasRareData())
         visitor->trace(elementRareData());
 
     ContainerNode::trace(visitor);
 }
 
 } // namespace WebCore