DevTools: do not suggest mapping workspace to itself, remove workspace mapping tip from behind expe…

Source/devtools/front_end/sourcesView.css

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 116 matching lines @@
 }
 
 .source-frame-infobar-icon {
     background-image: url(Images/statusbarButtonGlyphs.png);
     background-size: 320px 144px;
     width: 11px;
     height: 10px;
     margin-right: 4px;
     display: inline-block;
     margin-top: 1px;
+    flex: none;
 }
 
 .source-frame-infobar-info .source-frame-infobar-icon {
     background-position: -212px -107px;
 }
 
 .source-frame-infobar-warning .source-frame-infobar-icon {
     background-position: -202px -107px;
 }
 
 .source-frame-infobar-error .source-frame-infobar-icon {
     background-position: -202px -96px;
 }
 
 .source-frame-infobar-main-row {
     display: flex;
-    flex: 0 0 17px;
+    min-height: 17px;
     overflow: hidden;
     margin: 5px 10px 0px;
 }
 
 .source-frame-infobar-details-container {
     display: flex;
     flex-direction: column;
     padding: 5px 0;
 }
 
 .source-frame-infobar-details-row {
     display: flex;
     flex: none;
     margin: 3px 10px;
 }
 
 .source-frame-infobar-row-message {
     flex: 0 1 auto;
+    margin-bottom: 4px;
+}
+
+.source-frame-infobar-main-row .close-button {
+    flex: none;
 }
 
 .source-frame-infobar-toggle {
-    flex: auto;
+    flex: 1 0 auto;
     padding: 0 4px;
     -webkit-user-select: none;
 }
 
 .source-frame-infobar-link {
     text-decoration: underline;
     color: rgb(50, 50, 200);
     cursor: pointer;
 }
 
 .source-frame-infobar-details-url {
     flex: 0 1000 auto;
     color: rgb(50, 50, 200);
 }