Use xmlnsWithColon instead of literal

Source/core/xml/parser/XMLDocumentParser.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2008, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 897 matching lines @@
     const xmlChar* uri;
 };
 
 static inline void handleNamespaceAttributes(Vector<Attribute>& prefixedAttributes, const xmlChar** libxmlNamespaces, int nbNamespaces, ExceptionState& exceptionState)
 {
     xmlSAX2Namespace* namespaces = reinterpret_cast<xmlSAX2Namespace*>(libxmlNamespaces);
     for (int i = 0; i < nbNamespaces; ++i) {
         AtomicString namespaceQName = xmlnsAtom;
         AtomicString namespaceURI = toAtomicString(namespaces[i].uri);
         if (namespaces[i].prefix)
-            namespaceQName = "xmlns:" + toString(namespaces[i].prefix);
+            namespaceQName = WTF::xmlnsWithColon + namespaces[i].prefix;
 
         QualifiedName parsedName = anyName;
         if (!Element::parseAttributeName(parsedName, XMLNSNames::xmlnsNamespaceURI, namespaceQName, exceptionState))
             return;
 
         prefixedAttributes.append(Attribute(parsedName, namespaceURI));
     }
 }
 
 struct xmlSAX2Attributes {
@@ skipping 715 matching lines @@
     sax.initialized = XML_SAX2_MAGIC;
     RefPtr<XMLParserContext> parser = XMLParserContext::createStringParser(&sax, &state);
     String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
     parseChunk(parser->context(), parseString);
     finishParsing(parser->context());
     attrsOK = state.gotAttributes;
     return state.attributes;
 }
 
 } // namespace blink