Do not display local overlay suggestion box if there are no suggestions.

chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.css

 /* Copyright 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 {
   background-color: white;
   cursor: default;
   margin: 0;
   overflow: hidden;
 }
 
 #suggestionsBox {
   border-bottom: 1px #d9d9d9 solid;
   padding-bottom: 6px;
   padding-top: 6px;
 }
 
+#suggestionsBox:empty {

[samarth, 2013/04/15 22:49:10]

Please add a comment for why this is necessary: otherwise, it's a bit mysterious
imho.

[kmadhusu, 2013/04/15 22:55:51]

Done.

+  display: none;
+}
+
 .suggestion {
   -webkit-border-radius: 2px;
   background: -webkit-image-set(
       url('images/page_icon.png') 1x,
       url('images/2x/page_icon.png') 2x) no-repeat;
   padding-bottom: 2px;
   padding-top: 3px;
   white-space: nowrap;
 }
 
@@ skipping 22 matching lines @@
 }
 
 /* Styling for native suggestions, hidden by the shadow DOM. */
 .chrome_url {
   color: rgb(0, 153, 51);
 }
 
 .chrome_title {
   color: #666;
 }