Make iterator for Element's attributes more lightweight

Source/web/WebPageSerializerImpl.cpp

 /*
  * Copyright (C) 2009 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 285 matching lines @@
     StringBuilder result;
     // Do pre action for open tag.
     result.append(preActionBeforeSerializeOpenTag(element, param, &needSkip));
     if (needSkip)
         return;
     // Add open tag
     result.append('<');
     result.append(element->nodeName().lower());
     // Go through all attributes and serialize them.
     if (element->hasAttributes()) {
-        AttributeIteratorAccessor attributes = element->attributesIterator();
-        AttributeConstIterator end = attributes.end();
-        for (AttributeConstIterator it = attributes.begin(); it != end; ++it) {
+        AttributeCollection attributes = element->attributes();
+        AttributeCollection::const_iterator end = attributes.end();
+        for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
             result.append(' ');
             // Add attribute pair
             result.append(it->name().toString());
             result.appendLiteral("=\"");
             if (!it->value().isEmpty()) {
                 const String& attrValue = it->value();
 
                 // Check whether we need to replace some resource links
                 // with local resource paths.
                 const QualifiedName& attrName = it->name();
@@ skipping 196 matching lines @@
 
         encodeAndFlushBuffer(WebPageSerializerClient::CurrentFrameIsFinished, &param, ForceFlush);
     }
 
     ASSERT(m_dataBuffer.isEmpty());
     m_client->didSerializeDataForFrame(KURL(), WebCString("", 0), WebPageSerializerClient::AllFramesAreFinished);
     return didSerialization;
 }
 
 }  // namespace blink