Remove AttributeCollection's findIndex(Attr*) by using QualifiedName

third_party/WebKit/Source/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 2183 matching lines @@
 {
     if (attr->ownerElement() != this) {
         exceptionState.throwDOMException(NotFoundError, "The node provided is owned by another element.");
         return nullptr;
     }
 
     ASSERT(document() == attr->document());
 
     synchronizeAttribute(attr->qualifiedName());
 
-    size_t index = elementData()->attributes().findIndex(attr);
+    size_t index = elementData()->attributes().findIndex(attr->qualifiedName());
     if (index == kNotFound) {
         exceptionState.throwDOMException(NotFoundError, "The attribute was not found on this element.");
         return nullptr;
     }
 
     RefPtrWillBeRawPtr<Attr> guard(attr);
     detachAttrNodeAtIndex(attr, index);
     return guard.release();
 }
 
@@ skipping 1352 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink