DevTools: polish service worker inspector UI

third_party/WebKit/Source/devtools/front_end/ui/smallIcon.css

 /*
  * Copyright (c) 2015 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.
  */
 
 div {
     width: 10px;
     height: 10px;
-    margin-right: 2px;
+    margin-right: 4px;
     display: inline-block;
+    flex-shrink: 0;

[dgozman, 2016/04/26 23:38:22]

I'm worried this could break something else.

 }
 
 div.error-icon,
 div.revokedError-icon,
 div.warning-icon,
 div.info-icon,
 div.device-icon,
 div.red-ball,
 div.green-ball,
 div.orange-ball {
@@ skipping 38 matching lines @@
     background-position: -224px -96px;
 }
 
 div.green-ball {
     background-position: -235px -96px;
 }
 
 div.orange-ball {
     background-position: -246px -96px;
 }