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;

[Dan Beam, 2013/04/15 23:05:51]

display: inline-block;

(http://jsfiddle.net/hV7Rv/)

[kmadhusu, 2013/04/15 23:33:21]

This also works. Is there any specific reason to prefer display:inline-block
over display:none?

[Dan Beam, 2013/04/15 23:48:48]

less code, that's what it was intended for

[kmadhusu, 2013/04/15 23:59:57]

Done.

 }
 
+#suggestionsBox:empty {
+  /* Hide the empty suggestions box since they display a small white blank
+   * overlay. Refer to http://crbug.com/229839 for more details. */
+  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;
 }