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

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 1485 matching lines @@
             }
             elementAnimations->clearBaseComputedStyle();
         }
 
         if (ElementShadow* shadow = data->shadow())
             shadow->detach(context);
     }
 
     ContainerNode::detach(context);
 
-    ASSERT(needsAttach());
+    if (!context.performingReattach && isUserActionElement()) {
+        if (hovered())
+            document().hoveredNodeDetached(*this);
+        if (inActiveChain())
+            document().activeChainNodeDetached(*this);
+        document().userActionElements().didDetach(*this);
+    }
+
+    document().styleEngine().styleInvalidator().clearInvalidation(*this);
+
     if (svgFilterNeedsLayerUpdate())
         document().unscheduleSVGFilterLayerUpdateHack(*this);
+
+    ASSERT(needsAttach());
 }
 
 bool Element::pseudoStyleCacheIsInvalid(const ComputedStyle* currentStyle, ComputedStyle* newStyle)
 {
     ASSERT(currentStyle == computedStyle());
     ASSERT(layoutObject());
 
     if (!currentStyle)
         return false;
 
@@ skipping 1869 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink