DevTools: implement hidpi-friendly success/error/warning balls.

Source/devtools/front_end/resourceView.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 56 matching lines @@
 .resource-view.image img.resource-image-view {
     max-width: 100%;
     max-height: 1000px;
     background-image: url(Images/checker.png);
     -webkit-box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.5);
     -webkit-user-select: text;
     -webkit-user-drag: auto;
 }
 
 .resource-status-image {
-    margin-top: -3px;
+    margin-top: -2px;
+    margin-right: 3px;
     vertical-align: middle;
 }
 
 .resource-view.image .title {
     text-align: center;
     font-size: 13px;
 }
 
 .resource-view.image .infoList {
     margin: 0;
@@ skipping 12 matching lines @@
     padding-left: 8px;
     width: 50%;
     text-align: left;
     margin: 0;
 }
 
 .resource-view.image .infoList dd::after {
     white-space: pre;
     content: "\A";
 }