Fix scroll to section in the settings page.

chrome/browser/resources/options/browser_options.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 OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
 
   //
@@ skipping 621 matching lines @@
       }
 
       var pageContainer = $('page-container');
       // pageContainer.offsetTop is relative to the screen.
       var pageTop = pageContainer.offsetTop;
       var sectionBottom = section.offsetTop + section.offsetHeight;
       // section.offsetTop is relative to the 'page-container'.
       var sectionTop = section.offsetTop;
       if (pageTop + sectionBottom > document.body.scrollHeight ||
           pageTop + sectionTop < 0) {
-        pageContainer.oldScrollTop = -pageTop;
         // Currently not all layout updates are guaranteed to precede the
         // initializationComplete event (for example 'set-as-default-browser'
         // button) leaving some uncertainty in the optimal scroll position.
         // The section is placed approximately in the middle of the screen.
-        pageContainer.style.top = document.body.scrollHeight / 2 -
-            sectionBottom + 'px';
+        var top = Math.min(0, document.body.scrollHeight / 2 - sectionBottom);
+        pageContainer.style.top = top + 'px';
+        pageContainer.oldScrollTop = -top;
       }
     },
 
     /**
      * Adds a |webkitTransitionEnd| listener to the given section so that
      * it can be animated. The listener will only be added to a given section
      * once, so this can be called as multiple times.
      * @param {HTMLElement} section The section to be animated.
      * @private
      */
@@ skipping 905 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });