DevTools: migrate UI.ViewManager's expand icon over to UI.Icon

third_party/WebKit/Source/devtools/front_end/ui/viewContainers.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 39 matching lines @@
 }
 
 .expandable-view-title .toolbar {
     margin-top: -3px;
 }
 
 .expandable-view-title:not(.expanded) .toolbar {
     display: none;
 }
 
-.expandable-view-title::before {
-    -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 352px 168px;
-    background-color: #888;
-    float: left;
-    width: 11px;
-    height: 11px;
+.title-expand-icon {
     margin-right: 2px;
-    content: "a";
-    color: transparent;
-    flex-shrink: 0;
-}
-
-@media (-webkit-min-device-pixel-ratio: 1.1) {
-.expandable-view-title::before {
-    -webkit-mask-image: url(Images/toolbarButtonGlyphs_2x.png);
-}
-} /* media */
-
-.expandable-view-title::before {
-    -webkit-mask-position: -4px -96px;
-}
-
-.expandable-view-title.expanded::before {
-    -webkit-mask-position: -20px -96px;
 }
 
 .expandable-view-title > .toolbar {
     position: absolute;
     right: 0;
     top: 0;
 }
 
 .sidebar-pane-container .toolbar {
     border-bottom: 1px solid #eee;
 }
 
 .sidebar-pane-container .toolbar > * {
     pointer-events: auto;
 }