Reland of [DevTools] Show icon in top toolbar when Node target is available

third_party/WebKit/Source/devtools/front_end/sources/threadsSidebarPane.css

 /*
  * Copyright 2017 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.
  */
 
-.available-node-targets {
-    height: 22px;
-    display: flex;
-    align-items: center;
-    justify-content: flex-start;
-    padding-left: 20px;
-    border-top: 1px solid #eee;
-    font-style: italic;
-}
-
-.available-node-targets > span {
-    margin-left: 5px;
-}
-
 .thread-item {
     padding: 3px 8px 3px 20px;
     position: relative;
     min-height: 18px;
     line-height: 15px;
     display: flex;
     flex-wrap: wrap;
 }
 
 .thread-item + .thread-item {
@@ skipping 21 matching lines @@
     display: none;
     position: absolute;
     top: 5px;
     left: 4px;
 }
 
 .thread-item.selected .selected-thread-icon {
     display: block;
 }