Revert of Introduce SynchronousMutationObserver::didChangeAttribute()

third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h

 // Copyright 2016 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 SynchronousMutationNotifier_h
 #define SynchronousMutationNotifier_h
 
 #include "base/macros.h"
 #include "core/CoreExport.h"
 #include "platform/LifecycleNotifier.h"
 
 namespace blink {
 
 class CharacterData;
 class ContainerNode;
 class Document;
-class Element;
 class Node;
 class NodeWithIndex;
 class SynchronousMutationObserver;
 class Text;
 
 class CORE_EXPORT SynchronousMutationNotifier
     : public LifecycleNotifier<Document, SynchronousMutationObserver> {
  public:
-  void notifyChangeAttribute(const Element&);
+  // TODO(yosin): We will have |notifyXXX()| functions defined in
+  // |SynchronousMutationObserver|.
   void notifyChangeChildren(const ContainerNode&);
   void notifyMergeTextNodes(const Text& mergedNode,
                             const NodeWithIndex& nodeToBeRemovedWithIndex,
                             unsigned oldLength);
   void notifyMoveTreeToNewDocument(const Node&);
   void notifySplitTextNode(const Text&);
   void notifyUpdateCharacterData(CharacterData*,
                                  unsigned offset,
                                  unsigned oldLength,
                                  unsigned newLength);
   void notifyNodeChildrenWillBeRemoved(ContainerNode&);
   void notifyNodeWillBeRemoved(Node&);
 
  protected:
   SynchronousMutationNotifier();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SynchronousMutationNotifier);
 };
 
 }  // namespace dom
 
 #endif  // SynchronousMutationNotifier_h