Reskins the Compact and System VK to look closer to the IME VK.

ui/keyboard/resources/elements/kb-shift-key.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-shift-key" attributes="lowerCaseKeysetId
     upperCaseKeysetId" class="shift dark" char="Shift" on-pointerout="{{out}}"
     extends="kb-key">
   <template>
     <style>
       .shift-light-wrapper {
         bottom: 3px;
         height: 10%;
         margin: 0;
         padding: 0;
         position: absolute;
         width: 100%;
       }
 
       .shift-light {
-        -webkit-box-shadow: inset 0 1px #101010, inset 0 -1px #444444;
-        background-image: -webkit-linear-gradient(#101010, #000000);
-        border: solid;
-        border-bottom-color: #1d1d1d;
-        border-top-color: #2d2d2d;
-        border-width: 1px 0;
-        height: 0.3em;
+        background-color: #ffffff;
+        border: none;
+        height: 0.2em;
         margin: 0 auto;
         position: relative;
         width: 1.8em;
       }
     </style>
     <div class="shift-light-wrapper">
       <div class="shift-light"> </div>
     </div>
     <shadow></shadow>
   </template>
 </polymer-element>