Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/components/networkConditionsSettingsTab.css

 /*
  * Copyright 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.
  */
 
 .network-conditions-settings-tab .settings-tab.help-content {
     display: flex;
     flex-direction: column;
     align-items: flex-start;
@@ skipping 75 matching lines @@
     margin: 0 4px;
 }
 
 .network-conditions-settings-tab .conditions-list-separator-invisible {
     visibility: hidden;
 }
 
 .network-conditions-settings-tab .conditions-list-remove,
 .network-conditions-settings-tab .conditions-list-edit {
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     width: 32px;
     height: 24px;
     opacity: 0.5;
     cursor: pointer;
     flex: none;
     visibility: hidden;
     pointer-events: auto;
 }
 
 .network-conditions-settings-tab .conditions-list:not(.conditions-list-editing) .conditions-list-item:hover .conditions-list-remove,
@@ skipping 46 matching lines @@
     outline: auto 2px red;
     background-color: white;
 }
 
 .network-conditions-settings-tab .conditions-edit-optional {
     position: absolute;
     bottom: -20px;
     right: 0;
     color: rgb(128, 128, 128);
 }