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

third_party/WebKit/Source/devtools/front_end/ui/TextPrompt.js

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 97 matching lines @@
     this._boundOnMouseWheel = this.onMouseWheel.bind(this);
     this._boundClearAutocomplete = this.clearAutocomplete.bind(this);
     this._proxyElement = element.ownerDocument.createElement('span');
     var shadowRoot = UI.createShadowRootWithCoreStyles(this._proxyElement, 'ui/textPrompt.css');
     this._contentElement = shadowRoot.createChild('div', 'text-prompt-root');
     this._contentElement.createChild('content');
     this._proxyElement.style.display = this._proxyElementDisplay;
     element.parentElement.insertBefore(this._proxyElement, element);
     this._proxyElement.appendChild(element);
     this._element.classList.add('text-prompt');
+    this._element.setAttribute('contenteditable', 'plaintext-only');
     this._element.addEventListener('keydown', this._boundOnKeyDown, false);
     this._element.addEventListener('input', this._boundOnInput, false);
     this._element.addEventListener('mousewheel', this._boundOnMouseWheel, false);
     this._element.addEventListener('selectstart', this._boundClearAutocomplete, false);
     this._element.addEventListener('blur', this._boundClearAutocomplete, false);
 
     this._suggestBox = new UI.SuggestBox(this, 20, true);
 
     if (this._title)
       this._proxyElement.title = this._title;
 
     return this._proxyElement;
   }
 
   detach() {
     this._removeFromElement();
     this._focusRestorer.restore();
     this._proxyElement.parentElement.insertBefore(this._element, this._proxyElement);
     this._proxyElement.remove();
     delete this._proxyElement;
     this._element.classList.remove('text-prompt');
+    this._element.removeAttribute('contenteditable');
   }
 
   /**
    * @return {string}
    */
   textWithCurrentSuggestion() {
     var text = this.text();
     if (!this._queryRange)
       return text;
     return text.substring(0, this._queryRange.startColumn) + this._currentSuggestion +
@@ skipping 478 matching lines @@
     return this._proxyElement || null;
   }
 };
 
 UI.TextPrompt.DefaultAutocompletionTimeout = 250;
 
 /** @enum {symbol} */
 UI.TextPrompt.Events = {
   TextChanged: Symbol('TextChanged')
 };