Select option background added to fix Dark theme

front_end/ui/inspectorCommon.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.
  */
 
 * {
     /* This is required for correct sizing of flex items because we rely
      * on an old version of the flexbox spec.
      * Longer-term we should remove this, see crbug.com/473625 */
@@ skipping 215 matching lines @@
     outline: none;
     text-shadow: 0 1px 0 rgb(240, 240, 240);
     padding-right: 20px;
     padding-left: 6px;
     background-image: -webkit-image-set(url(Images/chromeSelect.png) 1x, url(Images/chromeSelect_2x.png) 2x), linear-gradient(#ededed, #ededed 38%, #dedede);
     background-position: right center;
     background-repeat: no-repeat;
     min-height: 24px;
 }
 
+.chrome-select optgroup,
+.chrome-select option {
+    background-color: #EEEEEE;
+    color: #222;
+}
+
 .chrome-select:enabled:hover {
     background-image: -webkit-image-set(url(Images/chromeSelect.png) 1x, url(Images/chromeSelect_2x.png) 2x), linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
     border-color: rgba(0, 0, 0, 0.3);
     box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12),
     inset 0 1px 2px rgba(255, 255, 255, 0.95);
     color: black;
 }
 
 .chrome-select:enabled:active {
     background-image: -webkit-image-set(url(Images/chromeSelect.png) 1x, url(Images/chromeSelect_2x.png) 2x), linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
@@ skipping 61 matching lines @@
     padding: 20px;
     position: absolute;
     top: 0;
     right: 0;
     bottom: 0;
     left: 0;
     font-size: 13px;
     overflow: auto;
     z-index: 500;
 }