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

Source/core/css/invalidation/StyleInvalidator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StyleInvalidator_h
 #define StyleInvalidator_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class DescendantInvalidationSet;
 class Document;
 class Element;
 
 class StyleInvalidator {
     DISALLOW_ALLOCATION();
     WTF_MAKE_NONCOPYABLE(StyleInvalidator);
 public:
     StyleInvalidator();
     ~StyleInvalidator();
     void invalidate(Document&);
     void scheduleInvalidation(PassRefPtrWillBeRawPtr<DescendantInvalidationSet>, Element&);
-
-    // Clears all style invalidation state for the passed node.
-    void clearInvalidation(Node&);
+    void clearInvalidation(Element&);
 
     void clearPendingInvalidations();
 
     DECLARE_TRACE();
 
 private:
     struct RecursionData {
         RecursionData()
             : m_invalidateCustomPseudo(false)
             , m_wholeSubtreeInvalid(false)
@@ skipping 55 matching lines @@
     using PendingInvalidationMap = WillBeHeapHashMap<RawPtrWillBeMember<Element>, OwnPtrWillBeMember<InvalidationList>>;
 
     InvalidationList& ensurePendingInvalidationList(Element&);
 
     PendingInvalidationMap m_pendingInvalidationMap;
 };
 
 } // namespace blink
 
 #endif // StyleInvalidator_h