DevTools: allow inspecting browsers using custom front-ends.

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.
  */
 
 body {
   color: rgb(48, 57, 66);
   font-family: Arial, sans-serif;
   font-size: 13px;
@@ skipping 199 matching lines @@
 .action {
   color: rgb(17, 85, 204);
   cursor: pointer;
   margin-right: 15px;
 }
 
 .action:hover {
   text-decoration: underline;
 }
 
+.browser-header .action {
+  margin-left: 10px;
+}
+
 .list:not(.pages) .subrow {
   min-height: 19px;
 }
 
 .action.disabled {
   opacity: 0.5;
   pointer-events: none;
 }
 
 .open > input {
@@ skipping 149 matching lines @@
 }
 
 #port-forwarding-config-buttons {
   align-items: center;
   display: flex;
 }
 
 #port-forwarding-config-buttons > label {
   flex-grow: 1
 }