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ui/webui/resources/js/i18n_behavior.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * 'I18nBehavior' is a behavior to mix in loading of
  * internationalization strings.
  *
  * Example:
  *   behaviors: [
  *     I18nBehavior,
  *   ],
  */
 
 /** @polymerBehavior */
 var I18nBehavior = {
   /**
    * @param {string} id The ID of the string to translate.
-   * @param {...string} var_args Placeholders required by the string ($1-9).
+   * @param {...string=} var_args Placeholders required by the string ($0-9).
    * @return {string} A translated, substituted string.
    */
   i18n: function(id, var_args) {
-    return loadTimeData.getStringF.apply(loadTimeData, arguments);
+    return arguments.length > 1 ?

[Dan Beam, 2016/04/02 02:08:16]

nit:

return arguments.length == 1 ? loadTimeData.getString(id) :
    loadTimeData.getString.apply(loadTimeData, arguments);

or something along these [2] lines ;)

[dpapad, 2016/04/04 17:25:51]

Done.

+        loadTimeData.getStringF.apply(loadTimeData, arguments) :
+        loadTimeData.getString.apply(loadTimeData, arguments);

[Dan Beam, 2016/04/02 02:08:16]

this is equivalent to loadTimeData.getString(id)

[dpapad, 2016/04/04 17:25:51]

Done.

   },
 };