Pass implementation object to supplemental classes by reference

Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * 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.
@@ skipping 407 matching lines @@
     // ASSERT(!oldChild->isPseudoElement())
     if (!oldChild || oldChild->parentNode() != this || oldChild->isPseudoElement()) {
         exceptionState.throwDOMException(NotFoundError, "The node to be removed is not a child of this node.");
         return;
     }
 
     RefPtr<Node> child = oldChild;
 
     document().removeFocusedElementOfSubtree(child.get());
 
-    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(&document()))
+    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document()))
         fullscreen->removeFullScreenElementOfSubtree(child.get());
 
     // Events fired when blurring currently focused node might have moved this
     // child into a different parent.
     if (child->parentNode() != this) {
         exceptionState.throwDOMException(NotFoundError, "The node to be removed is no longer a child of this node. Perhaps it was moved in a 'blur' event handler?");
         return;
     }
 
     willRemoveChild(*child);
@@ skipping 63 matching lines @@
 // this differs from other remove functions because it forcibly removes all the children,
 // regardless of read-only status or event exceptions, e.g.
 void ContainerNode::removeChildren()
 {
     if (!m_firstChild)
         return;
 
     // The container node can be removed from event handlers.
     RefPtr<ContainerNode> protect(this);
 
-    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(&document()))
+    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document()))
         fullscreen->removeFullScreenElementOfSubtree(this, true);
 
     // Do any prep work needed before actually starting to detach
     // and remove... e.g. stop loading frames, fire unload events.
     willRemoveChildren();
 
     {
         // Removing focus can cause frames to load, either via events (focusout, blur)
         // or widget updates (e.g., for <embed>).
         SubframeLoadingDisabler disabler(*this);
@@ skipping 515 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore