Restart the browsing data counters when the CBD dialog is opened.

chrome/browser/resources/options/clear_browser_data_overlay.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.
 
 cr.define('options', function() {
   var Page = cr.ui.pageManager.Page;
   var PageManager = cr.ui.pageManager.PageManager;
 
   /**
    * ClearBrowserDataOverlay class
@@ skipping 72 matching lines @@
       // browsing and download history should be cleared. Note that this is
       // different than just disabling them as a result of enterprise policies.
       if (!loadTimeData.getBoolean('showDeleteBrowsingHistoryCheckboxes')) {
         $('delete-browsing-history-container').hidden = true;
         $('delete-download-history-container').hidden = true;
       }
 
       this.updateStateOfControls_();
     },
 
+    /** @override */
+    didShowPage: function() {
+      chrome.send('openedClearBrowserData');
+    },
+
     /**
      * Create a footer that explains that some content is not cleared by the
      * clear browsing data dialog and warns that the deletion may be synced.
      * @param {boolean} simple Whether to use a simple support string.
      * @param {boolean} syncing Whether the user uses Sync.
      * @private
      */
     createFooter_: function(simple, syncing) {
       // The localized string is of the form "Saved [content settings] and
       // {search engines} will not be cleared and may reflect your browsing
@@ skipping 208 matching lines @@
     var topmostVisiblePage = PageManager.getTopmostVisiblePage();
     if (topmostVisiblePage && topmostVisiblePage.name == 'clearBrowserData')
       PageManager.closeOverlay();
   };
 
   // Export
   return {
     ClearBrowserDataOverlay: ClearBrowserDataOverlay
   };
 });