DevTools: Migrate from -webkit-user-modify to contenteditable

third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css

 /*
  * Copyright (c) 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.
  */
 
 .text-prompt-root {
     display: flex;
     align-items: center;
 }
 
 .text-prompt-editing {
-    -webkit-user-select: text;
     box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2),
                 0 2px 4px rgba(0, 0, 0, 0.2),
                 0 2px 6px rgba(0, 0, 0, 0.1);
     background-color: white;
-    -webkit-user-modify: read-write-plaintext-only;
     text-overflow: clip !important;
     padding-left: 2px;
     margin-left: -2px;
     padding-right: 2px;
     margin-right: -2px;
     margin-bottom: -1px;
     padding-bottom: 1px;
     opacity: 1.0 !important;
 }
 
 .text-prompt-editing,
 .text-prompt-editing ::content * {
     color: #222 !important;
     text-decoration: none !important;
-    -webkit-user-modify: read-write-plaintext-only;
     white-space: pre;
 }
 
 ::content .auto-complete-text {
     color: rgb(128, 128, 128) !important;
-    -webkit-user-select: none;
-    -webkit-user-modify: read-only;
 }
 
 ::content .text-prompt[data-placeholder]:empty::before {
     content: attr(data-placeholder);
     color: rgb(128, 128, 128);
 }
 
 ::content .text-prompt:not([data-placeholder]):empty::after {
     content: '\00A0';
     width: 0;
     display: block;
 }
 
 .text-prompt-editing ::content br {
     display: none;
 }