Reland r55881: Disable the 'Clear browsing Data' button when no checkboxes are checked.

chrome/browser/resources/options/clear_browser_data_overlay.js

 // Copyright (c) 2010 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 16 matching lines @@
 
     /**
      * Initialize the page.
      */
     initializePage: function() {
       // Call base class implementation to starts preference initialization.
       OptionsPage.prototype.initializePage.call(this);
 
       // Setup option values for the time period select control.
       $('clearBrowsingDataTimePeriod').initializeValues(
-          templateData.clearBrowsingDataTimeList)
+          templateData.clearBrowsingDataTimeList);
+
+      var f = cr.bind(this.updateButtonState_, 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);
+      });
+
+      var checkboxes = document.querySelectorAll(
+          '#checkboxListData input[type=checkbox]');
+      for (var i = 0; i < checkboxes.length; i++) {
+        checkboxes[i].onclick = f;
+      }
+      this.updateButtonState_();
 
       // Setup click handler for the clear(Ok) button.
       $('clearBrowsingDataCommit').onclick = function(event) {
         chrome.send('performClearBrowserData');
       };
-    }
+    },
+
+    updateButtonState_: function() {
+      var checkboxes = document.querySelectorAll(
+          '#checkboxListData input[type=checkbox]');
+      var isChecked = false;
+      for (var i = 0; i < checkboxes.length; i++) {
+        if (checkboxes[i].checked) {
+          isChecked = true;
+          break;
+        }
+      }
+      $('clearBrowsingDataCommit').disabled = !isChecked;
+    },
   };
 
   //
   // Chrome callbacks
   //
   ClearBrowserDataOverlay.setClearingState = function(state) {
     $('deleteBrowsingHistoryCheckbox').disabled = state;
     $('deleteDownloadHistoryCheckbox').disabled = state;
     $('deleteCacheCheckbox').disabled = state;
     $('deleteCookiesCheckbox').disabled = state;
@@ skipping 24 matching lines @@
     this.setClearingState(false);
   }
 
   // Export
   return {
     ClearBrowserDataOverlay: ClearBrowserDataOverlay
   };
 
 });