Move some Element specific code from Node::detach to Element::detach.

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 3327 matching lines @@
         return;
 
     // We can't be focused if we're not in the document.
     if (!node->inDocument())
         return;
     bool contains = node->containsIncludingShadowDOM(m_focusedElement.get());
     if (contains && (m_focusedElement != node || !amongChildrenOnly))
         setFocusedElement(nullptr);
 }
 
-void Document::hoveredNodeDetached(Node* node)
+void Document::hoveredNodeDetached(Element& element)
 {
-    ASSERT(node);
     if (!m_hoverNode)
         return;
 
     m_hoverNode->updateDistribution();
-    if (node != m_hoverNode && (!m_hoverNode->isTextNode() || node != ComposedTreeTraversal::parent(*m_hoverNode)))
+    if (element != m_hoverNode && (!m_hoverNode->isTextNode() || element != ComposedTreeTraversal::parent(*m_hoverNode)))
         return;
 
-    m_hoverNode = ComposedTreeTraversal::parent(*node);
+    m_hoverNode = ComposedTreeTraversal::parent(element);
     while (m_hoverNode && !m_hoverNode->layoutObject())
         m_hoverNode = ComposedTreeTraversal::parent(*m_hoverNode);
 
     // If the mouse cursor is not visible, do not clear existing
-    // hover effects on the ancestors of |node| and do not invoke
+    // hover effects on the ancestors of |element| and do not invoke
     // new hover effects on any other element.
     if (!page()->isCursorVisible())
         return;
 
     if (frame())
         frame()->eventHandler().scheduleHoverStateUpdate();
 }
 
-void Document::activeChainNodeDetached(Node* node)
+void Document::activeChainNodeDetached(Element& element)
 {
     if (!m_activeHoverElement)
         return;
 
-    if (node != m_activeHoverElement)
+    if (element != m_activeHoverElement)
         return;
 
-    Node* activeNode = ComposedTreeTraversal::parent(*node);
+    Node* activeNode = ComposedTreeTraversal::parent(element);
     while (activeNode && activeNode->isElementNode() && !activeNode->layoutObject())
         activeNode = ComposedTreeTraversal::parent(*activeNode);
 
     m_activeHoverElement = activeNode && activeNode->isElementNode() ? toElement(activeNode) : 0;
 }
 
 const Vector<AnnotatedRegionValue>& Document::annotatedRegions() const
 {
     return m_annotatedRegions;
 }
@@ skipping 2319 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif