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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).

[michaelpg, 2016/04/05 04:46:02]

(ERROR) Error in: i18n_behavior.js
##
/usr/local/google/home/michaelpg/dev/c/work3/src/ui/webui/resources/js/i18n_behavior.js:20:
ERROR - Bad type annotation. expected closing }
##    * @param {...string=} var_args Placeholders required by the string ($0-9).
##                       ^
## 
##
/usr/local/google/home/michaelpg/dev/c/work3/src/ui/webui/resources/js/i18n_behavior.js:20:
ERROR - Bad type annotation. expecting a variable name in a @param tag
##    * @param {...string=} var_args Placeholders required by the string ($0-9).
##                       ^

[dpapad, 2016/04/05 16:50:44]

This is addressed by https://codereview.chromium.org/1853323003.

    * @return {string} A translated, substituted string.
    */
   i18n: function(id, var_args) {
-    return loadTimeData.getStringF.apply(loadTimeData, arguments);
+    return arguments.length == 1 ? loadTimeData.getString(id) :
+        loadTimeData.getStringF.apply(loadTimeData, arguments);
   },
 };