Have ElementData::attributeItem() return a reference

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 291 matching lines @@
         return;
     // Add open tag
     result.append('<');
     result.append(element->nodeName().lower());
     // Go through all attributes and serialize them.
     if (element->hasAttributes()) {
         unsigned numAttrs = element->attributeCount();
         for (unsigned i = 0; i < numAttrs; i++) {
             result.append(' ');
             // Add attribute pair
-            const Attribute *attribute = element->attributeItem(i);
-            result.append(attribute->name().toString());
+            const Attribute& attribute = element->attributeItem(i);
+            result.append(attribute.name().toString());
             result.appendLiteral("=\"");
-            if (!attribute->value().isEmpty()) {
-                const String& attrValue = attribute->value();
+            if (!attribute.value().isEmpty()) {
+                const String& attrValue = attribute.value();
 
                 // Check whether we need to replace some resource links
                 // with local resource paths.
-                const QualifiedName& attrName = attribute->name();
+                const QualifiedName& attrName = attribute.name();
                 if (elementHasLegalLinkAttribute(element, attrName)) {
                     // For links start with "javascript:", we do not change it.
                     if (attrValue.startsWith("javascript:", false))
                         result.append(attrValue);
                     else {
                         // Get the absolute link
                         WebFrameImpl* subFrame = WebFrameImpl::fromFrameOwnerElement(element);
                         String completeURL = subFrame ? subFrame->frame()->document()->url() :
                                                         param->document->completeURL(attrValue);
                         // Check whether we have local files for those link.
@@ skipping 186 matching lines @@
 
         encodeAndFlushBuffer(WebPageSerializerClient::CurrentFrameIsFinished, &param, ForceFlush);
     }
 
     ASSERT(m_dataBuffer.isEmpty());
     m_client->didSerializeDataForFrame(KURL(), WebCString("", 0), WebPageSerializerClient::AllFramesAreFinished);
     return didSerialization;
 }
 
 }  // namespace blink