Fix selector namespace prefix resolution.

third_party/WebKit/Source/web/WebSelector.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 20 matching lines @@
 #include "public/web/WebSelector.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/parser/CSSParser.h"
 #include "public/platform/WebString.h"
 
 namespace blink {
 
 WebString canonicalizeSelector(WebString webSelector, WebSelectorType restriction)
 {
-    CSSSelectorList selectorList = CSSParser::parseSelector(strictCSSParserContext(), webSelector);
+    CSSSelectorList selectorList = CSSParser::parseSelector(strictCSSParserContext(), nullptr, webSelector);
 
     if (restriction == WebSelectorTypeCompound) {
         for (const CSSSelector* selector = selectorList.first(); selector; selector = selectorList.next(*selector)) {
             if (!selector->isCompound())
                 return WebString();
         }
     }
     return selectorList.selectorsText();
 }
 
 } // namespace blink