Remove attrs sky doesn't support.

sky/engine/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 91 matching lines @@
 #endif
 
     void removedLastRefToScope();
 
     bool isInclusiveAncestorOf(const TreeScope&) const;
     unsigned short comparePosition(const TreeScope&) const;
 
     const TreeScope* commonAncestorTreeScope(const TreeScope& other) const;
     TreeScope* commonAncestorTreeScope(TreeScope& other);
 
-    Element* getElementByAccessKey(const String& key) const;
-
     ScopedStyleResolver& scopedStyleResolver() const { return *m_scopedStyleResolver; }
 
 protected:
     TreeScope(ContainerNode&, Document&);
     explicit TreeScope(Document&);
     virtual ~TreeScope();
 
 #if !ENABLE(OILPAN)
     void destroyTreeScopeData();
 #endif
@@ skipping 40 matching lines @@
 };
 
 DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(TreeScope)
 
 HitTestResult hitTestInDocument(const Document*, int x, int y);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_DOM_TREESCOPE_H_