[DevTools] Expose left and right toolbar in TabbedPane.

third_party/WebKit/Source/devtools/front_end/sources/sourcesPanel.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 37 matching lines @@
 .scripts-debug-toolbar-drawer.expanded {
     margin-top: 0;
 }
 
 .scripts-debug-toolbar-drawer > label {
     display: flex;
     padding-left: 3px;
     height: 28px;
 }
 
-.sources-editor-tabstrip-left {
-    width: 22px;
-}
-
-.sources-editor-tabstrip-right {
-    width: 36px;
-}
-
 .function-location-link {
     float: right;
     margin-left: 10px;
 }
 
 .function-location-step-into {
     position: relative;
     height: 14px;
     transform: rotate(-90deg);
 }
@@ skipping 197 matching lines @@
     text-align: center;
     font-style: italic;
     padding: 4px;
     color: #888;
     background-color: #FFFFC2;
 }
 
 .event-listeners-sidebar-pane .toolbar {
     border-bottom: 1px solid #eee;
 }