Remove attrs sky doesn't support.

sky/engine/core/dom/TreeScope.cpp

 /*
  * 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 350 matching lines @@
 
 bool TreeScope::isInclusiveAncestorOf(const TreeScope& scope) const
 {
     for (const TreeScope* current = &scope; current; current = current->parentTreeScope()) {
         if (current == this)
             return true;
     }
     return false;
 }
 
-Element* TreeScope::getElementByAccessKey(const String& key) const
-{
-    if (key.isEmpty())
-        return 0;
-    Element* result = 0;
-    Node& root = rootNode();
-    for (Element* element = ElementTraversal::firstWithin(root); element; element = ElementTraversal::next(*element, &root)) {
-        if (equalIgnoringCase(element->getAttribute(HTMLNames::accesskeyAttr), key))
-            result = element;
-        if (ShadowRoot* shadowRoot = element->shadowRoot()) {
-            if (Element* shadowResult = shadowRoot->getElementByAccessKey(key))
-                result = shadowResult;
-        }
-    }
-    return result;
-}
-
 void TreeScope::setNeedsStyleRecalcForViewportUnits()
 {
     for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::next(*element)) {
         if (ShadowRoot* root = element->shadowRoot())
             root->setNeedsStyleRecalcForViewportUnits();
         RenderStyle* style = element->renderStyle();
         if (style && style->hasViewportUnits())
             element->setNeedsStyleRecalc(LocalStyleChange);
     }
 }
@@ skipping 10 matching lines @@
 
     for (size_t i = 0; i < list.size(); i++) {
         if (list[i]->contents() != otherList[i]->contents())
             return false;
     }
 
     return true;
 }
 
 } // namespace blink