Move language detection to a component

chrome/browser/resources/translate.js

 // Copyright (c) 2012 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.
 
 // This code is used in conjunction with the Google Translate Element script.
 // It is executed in an isolated world of a page to translate it from one
 // language to another.
 // It should be included in the page before the Translate Element script.
 
 var cr = cr || {};
@@ skipping 161 matching lines @@
      * has been successfully translated and the original language specified to
      * the translate function was 'auto'. Is empty otherwise.
      * Some versions of Element library don't provide |getDetectedLanguage|
      * function. In that case, this function returns 'und'.
      * @type {boolean}
      */
     get sourceLang() {
       if (!libReady || !finished || errorCode != ERROR['NONE'])
         return '';
       if (!lib.getDetectedLanguage)
-        return 'und'; // defined as chrome::kUnknownLanguageCode in C++ world.
+        return 'und'; // Defined as translate::kUnknownLanguageCode in C++.
       return lib.getDetectedLanguage();
     },
 
     /**
      * Time in msec from this script being injected to all server side scripts
      * being loaded.
      * @type {number}
      */
     get loadTime() {
       if (loadedTime == 0)
@@ skipping 112 matching lines @@
         if (this.status != 200) {
           errorCode = ERROR['SCRIPT_LOAD_ERROR'];
           return;
         }
         eval(this.responseText);
       }
       xhr.send();
     }
   };
 })();