Improve keyboard navigation on 'Manage search engines' options page

chrome/browser/resources/options/options_page.css

 /* 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. */
 
 body {
   position: relative;
 }
 
 #main-content {
   bottom: 0;
@@ skipping 293 matching lines @@
   white-space: nowrap;
 }
 
 list[type='text'][inlineeditable] input {
   box-sizing: border-box;
   margin: 0;
   width: 100%;
 }
 
 list > :not([editing]) [displaymode='edit'] {
-  display: none;
-}
-
-list > [editing] [displaymode='static'] {
-  /* Don't use display:none because we need to keep an element focusable. */
-  left: 0;
-  pointer-events: none;
-  position: absolute;
-  visibility: hidden;
+  border: none;
+  background-color: rgb(255, 255, 255);

[Dan Beam, 2014/10/18 01:35:44]

^ why is this necessary?  also, why not "white"?

 }
 
 list > [editing] input:invalid {
   /* TODO(stuartmorgan): Replace with validity badge */
   background-color: pink;
 }
 
 .list-inline-button {
   -webkit-appearance: none;
   -webkit-transition: opacity 150ms;
@@ skipping 95 matching lines @@
 html:not([hasFlashPlugin]) .flash-plugin-area,
 /* If the Flash plug-in supports the NPP_ClearSiteData API, we don't need to
  * show the link to the Flash storage settings manager:
  */
 html[flashPluginSupportsClearSiteData] .flash-plugin-area,
 html:not([flashPluginSupportsClearSiteData]) .clear-plugin-lso-data-enabled,
 html[flashPluginSupportsClearSiteData] .clear-plugin-lso-data-disabled,
 html:not([enablePepperFlashSettings]) .pepper-flash-settings {
   display: none;
 }