DevTools: get rid of deviceMetics settings.

Source/devtools/front_end/responsiveDesignView.css

 /*
  * Copyright 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.
  */
 
 .responsive-design {
     overflow: hidden;
     position: relative;
 }
@@ skipping 83 matching lines @@
 
 .responsive-design-toolbar input[type='text'] {
     color: rgb(255, 156, 0);
     text-align: center;
     background-color: transparent;
     border: none;
     margin: 0 2px;
     padding: 3px;
 }
 
+.responsive-design-toolbar input[type='text']:disabled {
+    opacity: 0.6;
+}
+
 .responsive-design-toolbar input[type='checkbox'] {
     background: none;
     margin: 0;
-    margin-right: 3px;
+    margin-right: 5px;
 }
 
 .responsive-design-toolbar input[type='checkbox']:after {
-    content:'\2714';
+    content:'\2713';
     color: transparent;
     line-height: 10px;
     position: absolute;
     cursor: pointer;
     background: rgb(64, 64, 64);
     border: 1px solid hsla(41, 100%, 47%, 0.6);
 }
 
 .responsive-design-toolbar input[type='checkbox']:checked:after {
     color: hsl(41, 100%, 47%);
@@ skipping 11 matching lines @@
 .responsive-design-toolbar input:focus {
     background-color: rgb(102, 102, 102)
 }
 
 .responsive-design-toolbar button {
     color: rgb(255, 156, 0);
     background-color: rgb(64, 64, 64);
     border: none;
     cursor: pointer;
 }