Hide isXXX() type checking methods in subclasses

Source/core/dom/Document.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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 3472 matching lines @@
 
     if (frame())
         frame()->eventHandler().scheduleHoverStateUpdate();
 }
 
 void Document::activeChainNodeDetached(Node* node)
 {
     if (!m_activeHoverElement)
         return;
 
-    if (node != m_activeHoverElement && (!m_activeHoverElement->isTextNode() || node != NodeRenderingTraversal::parent(m_activeHoverElement.get())))
+    if (node != m_activeHoverElement)
         return;
 
     Node* activeNode = NodeRenderingTraversal::parent(node);
     while (activeNode && activeNode->isElementNode() && !activeNode->renderer())
         activeNode = NodeRenderingTraversal::parent(activeNode);
 
     m_activeHoverElement = activeNode && activeNode->isElementNode() ? toElement(activeNode) : 0;
 }
 
 const Vector<AnnotatedRegionValue>& Document::annotatedRegions() const
@@ skipping 2388 matching lines @@
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (WeakDocumentSet::const_iterator it = set.begin(); it != set.end(); ++it) {
         fprintf(stderr, "- Document %p URL: %s\n", *it, (*it)->url().string().utf8().data());
     }
 }
 #endif