[DevTools] Tuned console completion filter to allow non-ascii properties auto-completion.

Source/devtools/front_end/RuntimeModel.js

 /*
  * Copyright (C) 2012 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 284 matching lines @@
             const keywords = ["break", "case", "catch", "continue", "default", "delete", "do", "else", "finally", "for", "function", "if", "in",
                               "instanceof", "new", "return", "switch", "this", "throw", "try", "typeof", "var", "void", "while", "with"];
             properties = properties.concat(keywords);
         }
 
         properties.sort();
 
         for (var i = 0; i < properties.length; ++i) {
             var property = properties[i];
 
-            if (dotNotation && !/^[a-zA-Z_$][a-zA-Z0-9_$]*$/.test(property))
+            // Assume that all non-ASCII characters are letters and thus can be used as part of identifier.
+            if (dotNotation && !/^[a-zA-Z_$\u008F-\uFFFF][a-zA-Z0-9_$\u008F-\uFFFF]*$/.test(property))
                 continue;
 
             if (bracketNotation) {
                 if (!/^[0-9]+$/.test(property))
                     property = quoteUsed + property.escapeCharacters(quoteUsed + "\\") + quoteUsed;
                 property += "]";
             }
 
             if (property.length < prefix.length)
                 continue;
@@ skipping 131 matching lines @@
         if (subtitle) {
             if (!name)
                 return subtitle;
             return name + "( " + subtitle + " )";
         }
         return "<iframe>";
     },
 
     __proto__: WebInspector.Object.prototype
 }