Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/ui/closeButton.css

 /*
  * Copyright (c) 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 div {
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 div {
     background-image: url(Images/toolbarButtonGlyphs_2x.png);
 }
 } /* media */
 
 .close-button {
     width: 14px;
@@ skipping 16 matching lines @@
     background-position: -175px -96px;
 }
 
 .close-button-gray:hover {
     background-position: -143px -96px;
 }
 
 .close-button-gray:active {
     background-position: -160px -96px;
 }