DevTools: Dropdown lists shouldn't have grey background color

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 196 matching lines @@
     height: 22px;
     margin-top: 2px;
     margin-bottom: 2px;
 }
 
 select.toolbar-item[data-keyboard-focus="true"]:focus {
     background: rgba(0, 0, 0, 0.08);
     border-radius: 2px;
 }
 
+select.toolbar-item[data-keyboard-focus="true"]:focus > * {
+    background: white;
+}
+
 /* Input */
 
 .toolbar-input {
     width: 120px;
     height: 20px;
     padding: 3px;
     margin: 1px 3px;
     background-color: white;
     border: solid 1px #d8d8d8;
     min-width: 35px;
@@ skipping 69 matching lines @@
     margin-top: -1px;
     width: 28px;
     left: -2px;
 }
 
 span.toolbar-select-container.toolbar-item.warning {
     background: #ffd7d7;
     padding: 0 5px 0 0;
     margin-right: 1px;
 }