DevTools: brush up responsive design toolbar css.

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 59 matching lines @@
 
 .responsive-design-resolution-width {
     top: 0;
 }
 
 .responsive-design-resolution-height {
     left: 0;
 }
 
 .responsive-design-toolbar {
-    flex: 0 0 24px;
+    flex: none;
     background-color: rgb(64, 64, 64);
     color: rgb(180, 180, 180);
-    display: flex;
-    align-items: center;
-    border-bottom: 1px solid rgb(163, 163, 163);
-    white-space: nowrap;
 }
 
 .responsive-design-toolbar fieldset,
 .responsive-design-toolbar p {
     margin: 0;
     padding: 0;
     border: 0;
     display: inline-block;
 }
 
-.responsive-design-toolbar fieldset {
-    padding: 0 7px 0 0;
-    height: 23px;
-}
-
 .responsive-design-toolbar .responsive-design-section {
-    border-left: 1px solid rgb(163, 163, 163);
-}
-
-.responsive-design-toolbar fieldset:first-child {
-    border-right: none;
+    display: inline-flex;
+    height: 24px;
+    border: 1px solid rgb(163, 163, 163);
+    border-left: none;
+    margin-top: -1px;
+    white-space: nowrap;
+    align-items: center;
+    padding-right: 3px;
 }
 
 .responsive-design-toolbar .field-error-message {
     display: none;
 }
-.responsive-design-toolbar fieldset > label {
-    display: inline-flex;
-    height: 22px;
-    align-items: center;
-}
 
 .responsive-design-toolbar input[type='text'] {
     color: rgb(255, 156, 0);
     text-align: center;
     background-color: transparent;
     border: none;
     margin: 0;
     padding: 3px 0;
 }
 
 .responsive-design-toolbar input:disabled,
 .responsive-design-toolbar button:disabled {
     opacity: 0.7;
 }
 
 .responsive-design-toolbar input[type='checkbox'] {
     -webkit-appearance: none;
     margin: 0 5px 0 7px;
     border: 1px solid rgb(45, 45, 45);
     border-radius: 3px;
     background-color: rgb(102, 102, 102);
+    position: relative;
+    top: 1px;
 }
 
 .responsive-design-toolbar input[type='checkbox']:after {
     content: '';
     line-height: 10px;
     position: absolute;
     cursor: pointer;
     width: 12px;
     height: 12px;
     background: none;
 }
 
 .responsive-design-toolbar input[type='checkbox']:checked:after {
     background: rgb(220, 220, 220);
 }
 
 .responsive-design-toolbar input.error-input {
     color: red;
     text-decoration: line-through;
 }
 
 .responsive-design-toolbar select {
     width: 150px;
     background-color: transparent;
     color: rgb(255, 156, 0);
     border: 0;
     margin-left: 10px;
     line-height: 16px;
+    position: relative;
+    top: 1px;
 }
 
 .responsive-design-toolbar input:focus {
     background-color: rgb(102, 102, 102)
 }
 
 .responsive-design-icon {
     background-color: rgb(180, 180, 180);
     -webkit-mask-image: url(Images/responsiveDesign.png);
     -webkit-mask-size: 48px 16px;
@@ skipping 67 matching lines @@
     float: left;
     margin-right: 4px;
     margin-left: 2px;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .responsive-design-warning::before {
     background-image: url(Images/statusbarButtonGlyphs_2x.png);
 }
 } /* media */