Move attributes-related API from UniqueElementData to AttributeCollection

Source/core/dom/ElementData.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 194 matching lines @@
 PassRefPtrWillBeRawPtr<ShareableElementData> UniqueElementData::makeShareableCopy() const
 {
 #if ENABLE(OILPAN)
     void* slot = Heap::allocate<ElementData>(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size()));
 #else
     void* slot = WTF::fastMalloc(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size()));
 #endif
     return adoptRefWillBeNoop(new (slot) ShareableElementData(*this));
 }
 
-Attribute* UniqueElementData::findAttributeByName(const QualifiedName& name)
-{
-    unsigned length = m_attributeVector.size();
-    for (unsigned i = 0; i < length; ++i) {
-        if (m_attributeVector.at(i).name().matches(name))
-            return &m_attributeVector.at(i);
-    }
-    return 0;
-}
-
 void UniqueElementData::traceAfterDispatch(Visitor* visitor)
 {
     visitor->trace(m_presentationAttributeStyle);
     ElementData::traceAfterDispatch(visitor);
 }
 
 } // namespace blink