Remove attrs sky doesn't support.

sky/engine/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 258 matching lines @@
 Node::NodeType Element::nodeType() const
 {
     return ELEMENT_NODE;
 }
 
 void Element::synchronizeAllAttributes() const
 {
     synchronizeAttribute(HTMLNames::styleAttr.localName());
 }
 
-String Element::title() const
-{
-    return getAttribute(HTMLNames::titleAttr);
-}
-
 String Element::contentEditable() const
 {
     const AtomicString& value = getAttribute(HTMLNames::contenteditableAttr);
 
     if (value.isNull())
         return "inherit";
     if (value.isEmpty() || equalIgnoringCase(value, "true"))
         return "true";
     if (equalIgnoringCase(value, "false"))
          return "false";
@@ skipping 1537 matching lines @@
         return false;
     if (treeScope().scopedStyleResolver().features().hasSelectorForId(idValue))
         return true;
     // Host rules could also have effects.
     if (ShadowRoot* shadowRoot = this->shadowRoot())
         return shadowRoot->scopedStyleResolver().features().hasSelectorForId(idValue);
     return false;
 }
 
 } // namespace blink