DevTools: do not use CSSMetadata instances for autocompletion

third_party/WebKit/Source/devtools/front_end/sources/CSSSourceFrame.js

 /*
  * 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 340 matching lines @@
     {
         var prefix = editor.copyRange(prefixRange);
         if (prefix.startsWith("$"))
             return this._simpleDelegate.wordsWithPrefix(editor, prefixRange, substituteRange);
         var propertyToken = this._backtrackPropertyToken(editor, prefixRange.startLine, prefixRange.startColumn - 1);
         if (!propertyToken)
             return this._simpleDelegate.wordsWithPrefix(editor, prefixRange, substituteRange);
 
         var line = editor.line(prefixRange.startLine);
         var tokenContent = line.substring(propertyToken.startColumn, propertyToken.endColumn);
-        var keywords = WebInspector.CSSMetadata.keywordsForProperty(tokenContent);
-        return keywords.startsWith(prefix);
+        var propertyValues = WebInspector.CSSMetadata.propertyValues(tokenContent);
+        return propertyValues.filter(value => value.startsWith(prefix));
     },
 }