Regression:[Devtools]Unable to close 'This script is blackboxed..' warning message without closing …

third_party/WebKit/Source/devtools/front_end/ui/infobar.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.
  */
 
 .infobar {
     color: rgb(34, 34, 34);
     display: flex;
     flex: auto;
     border-bottom: 1px solid rgb(171, 171, 171);
     flex-direction: column;
     align-items: stretch;
+    position: relative;
 }
 
 .infobar-warning {
     background-color: rgb(253, 242, 192);
 }
 
 .infobar-info {
     background-color: rgb(255, 255, 255);
 }
 
@@ skipping 56 matching lines @@
 .warning-icon {
     -webkit-mask-image: url(Images/ic_warning_black_18dp.svg);
     background-color: hsl(44, 92%, 50%);
 }
 
 .icon {
     -webkit-mask-size: 18px 18px;
     width: 18px;
     height: 19px;
 }