Re-add workaround that allowed keyboard navigation of options pages to work.

chrome/browser/resources/options/options_page.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() {
   /////////////////////////////////////////////////////////////////////////////
   // OptionsPage class:
 
   /**
    * Base class for options page.
@@ skipping 669 matching lines @@
    * closing subpages and/or stopping event propagation.
    * @return {Event} a mousedown or click event.
    * @private
    */
   OptionsPage.bodyMouseEventHandler_ = function(event) {
     // Do nothing if a subpage isn't showing.
     var topPage = this.getTopmostVisiblePage();
     if (!topPage || topPage.isOverlay || !topPage.parentPage)
       return;
 
+    // Do nothing if the client coordinates are not within the source element.
+    // This occurs if the user toggles a checkbox by pressing spacebar.
+    // This is a workaround to prevent keyboard events from closing the window.
+    // See: crosbug.com/15678
+    if (event.clientX == -document.body.scrollLeft &&
+        event.clientY == -document.body.scrollTop) {
+      return;
+    }
+
     // Don't interfere with navbar clicks.
     if ($('navbar').contains(event.target))
       return;
 
     // Figure out which page the click happened in.
     for (var level = topPage.nestingLevel; level >= 0; level--) {
       var clickIsWithinLevel = level == 0 ? true :
           OptionsPage.elementContainsPoint_(
               $('subpage-sheet-' + level), event.clientX, event.clientY);
 
@@ skipping 289 matching lines @@
     shouldClose: function() {
       return true;
     },
   };
 
   // Export
   return {
     OptionsPage: OptionsPage
   };
 });