Tidy up <select>s in tabbed options.

chrome/browser/resources/options/clear_browser_data.js

 // Copyright (c) 2011 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.
 
 cr.define('options', function() {
 
   var OptionsPage = options.OptionsPage;
 
   /**
    * ClearBrowserData class
@@ skipping 14 matching lines @@
     // Inherit ClearBrowserDataPage from OptionsPage.
     __proto__: OptionsPage.prototype,
 
     /**
      * Initialize the page.
      */
     initializePage: function() {
       // Call base class implementation to starts preference initialization.
       OptionsPage.prototype.initializePage.call(this);
 
-      // The time period is stored as a number.
-      $('clearBrowsingDataTimePeriod').dataType = 'number';
-
       var f = this.updateCommitButtonState_.bind(this);
       var types = ['browser.clear_data.browsing_history',
                    'browser.clear_data.download_history',
                    'browser.clear_data.cache',
                    'browser.clear_data.cookies',
                    'browser.clear_data.passwords',
                    'browser.clear_data.form_data'];
       types.forEach(function(type) {
           Preferences.getInstance().addEventListener(type, f);
       });
@@ skipping 64 matching lines @@
     this.setClearingState(false);
   }
 
   // Export
   return {
     ClearBrowserDataPage: ClearBrowserDataPage
   };
 
 });