DevTools: Fix an exception on adding watch expression.

third_party/WebKit/Source/devtools/front_end/accessibility/ARIAAttributesView.js

 // Copyright 2016 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.
 /**
  * @unrestricted
  */
 Accessibility.ARIAAttributesPane = class extends Accessibility.AccessibilitySubPane {
   constructor() {
     super(Common.UIString('ARIA Attributes'));
 
@@ skipping 118 matching lines @@
       this._editingCommitted(text, previousContent);
     }
 
     this._prompt = new Accessibility.ARIAAttributesPane.ARIAAttributePrompt(
         Accessibility.ariaMetadata().valuesForProperty(this._nameElement.textContent), this);
     this._prompt.setAutocompletionTimeout(0);
     var proxyElement = this._prompt.attachAndStartEditing(valueElement, blurListener.bind(this, previousContent));
 
     proxyElement.addEventListener('keydown', this._editingValueKeyDown.bind(this, previousContent), false);
 
-    valueElement.getComponentSelection().setBaseAndExtent(valueElement, 0, valueElement, 1);
+    valueElement.getComponentSelection().selectAllChildren(valueElement);
   }
 
   _removePrompt() {
     if (!this._prompt)
       return;
     this._prompt.detach();
     delete this._prompt;
   }
 
   /**
@@ skipping 97 matching lines @@
   'aria-readonly',
   'aria-relevant',
   'aria-required',
   'aria-setsize',
   'aria-sort',
   'aria-valuemax',
   'aria-valuemin',
   'aria-valuenow',
   'aria-valuetext',
 ];