[DevTools] Promote Device Mode v2 to default experiments.

third_party/WebKit/Source/devtools/front_end/ui/toolbar.css

 /*
  * Copyright (c) 2014 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.
  */
 
 :host {
     flex: none;
     padding: 0 2px;
 }
@@ skipping 266 matching lines @@
 
 .menu-toolbar-item .glyph {
     -webkit-mask-position: -192px -24px;
 }
 
 .node-search-toolbar-item .glyph {
     -webkit-mask-position: -320px -120px;
 }
 
 .emulation-toolbar-item .glyph {
+    -webkit-mask-position: -288px -144px;
+}
+
+@media (-webkit-min-device-pixel-ratio: 1.5) {
+.emulation-toolbar-item .glyph {
     -webkit-mask-position: -160px 0;
 }
+}
 
 .emulation-toolbar-item.warning::after {
     background-image: url(Images/toolbarButtonGlyphs.png);
     background-size: 352px 168px;
     width: 10px;
     height: 12px;
     content: "";
     position: absolute;
     right: 3px;
     bottom: 2px;
@@ skipping 245 matching lines @@
 
 .block-toolbar-item .glyph {
     -webkit-mask-position: -32px -144px;
 }
 
 .block-toolbar-item.toggled-active .glyph {
     background-color: rgb(216, 0, 0) !important;
 }
 
 .desktop-toolbar-item .glyph {
+    -webkit-mask-position: -256px -144px;
+}
+
+@media (-webkit-min-device-pixel-ratio: 1.5) {
+.desktop-toolbar-item .glyph {
     -webkit-mask-position: -160px -144px;
 }
+}
 
 .rotate-screen-toolbar-item .glyph {
     -webkit-mask-position: -192px -144px;
 }
 
 .fullscreen-toolbar-item .glyph {
     -webkit-mask-position: -224px -144px;
 }