DevTools: use view locations in the elements and sources sidebars.

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 31 matching lines @@
     overflow: hidden;
     position: relative;
     border-bottom: 1px solid transparent;
 }
 
 .expandable-view-title.expanded,
 .expandable-view-title:last-child {
     border-bottom: 1px solid #ddd;
 }
 
+.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;
     margin-right: 2px;
     content: "a";
     color: transparent;
@@ skipping 20 matching lines @@
     top: 0;
 }
 
 .sidebar-pane-container .toolbar {
     border-bottom: 1px solid #eee;
 }
 
 .sidebar-pane-container .toolbar > * {
     pointer-events: auto;
 }