Get rid of a couple references to IDR_WARNING

chrome/browser/resources/inspect/inspect.css

 /* Copyright (c) 2012 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. */
 
 * {
   box-sizing: border-box;
 }
 
 body {
   color: rgb(48, 57, 66);
@@ skipping 264 matching lines @@
   align-items: center;
   border-bottom: 1px solid #eee;
   display: flex;
   padding: 5px 0;
 }
 
 #device-settings button {
   margin-left: 15px;
 }
 
-.warning {
-  background-image: -webkit-image-set(url(chrome://theme/IDR_WARNING) 1x,
-                                      url(chrome://theme/IDR_WARNING@2x) 2x);
-  background-position: 0 center;
-  background-repeat: no-repeat;
-  background-size: 24px 21px;
-  margin-top: 5px;
-  padding-left: 25px;
-}
-
 #port-forwarding-config::backdrop {
   background-color: rgba(255, 255, 255, 0.75);
 }
 
 #port-forwarding-config {
   background: white;
   border: 0;
   border-radius: 3px;
   box-shadow: 0 4px 23px 5px rgba(0, 0, 0, 0.2), 0 2px 6px rgba(0,0,0,0.15);
   color: #333;
@@ skipping 111 matching lines @@
 @media (min-width: 47em) {
   #container {
     height: 100vh;
   }
   #navigation,
   #content {
     height: 100vh;
     overflow: auto;
   }
 }