Clean up a11y keyboard menu.

ui/keyboard/resources/elements/kb-options-menu.html

 <!--
   -- Copyright 2013 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.
   -->
 
 <polymer-element name="kb-options-menu-item" attributes="layout label active"
     on-pointerup="up" on-pointerover="over" on-pointerout="out">
   <template>
     <style>
@@ skipping 81 matching lines @@
         position: absolute;
         top: 0;
         white-space:nowrap;
         z-index: 1;
       }
     </style>
     <!-- TODO(kevers): This is a temporary placeholder to enable testing
       -- of layout switching.  Deprecate once a decision is reached on
       -- a more permanent solution for layout selection. -->
     <kb-options-menu-toggle-lock-item></kb-options-menu-toggle-lock-item>
-    <kb-options-menu-item layout="system-qwerty" label="System QWERTY">
-    </kb-options-menu-item>
-    <kb-options-menu-item layout="qwerty" label="QWERTY">
-    </kb-options-menu-item>
-    <kb-options-menu-item layout="dvorak" label="Dvorak">
-    </kb-options-menu-item>
     <kb-options-menu-item layout="none" label="Hide keyboard">
     </kb-options-menu-item>
   </template>
 </polymer-element>
 
 <polymer-element name="kb-keyboard-overlay" attributes="keyset"
     on-pointerup="up">
   <template>
     <style>
       :host {
@@ skipping 17 matching lines @@
 
       hiddenChanged: function() {
         this.fire('stateChange', {
           state: 'overlayVisibility',
           value: !!this.hidden
         });
       }
     });
   </script>
 </polymer-element>