Add [NewObject] and [SameObject] to various interfaces

Source/core/dom/Text.idl

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 // https://dom.spec.whatwg.org/#interface-text
 
 [
     Constructor(optional DOMString data = ""),
     ConstructorCallWith=Document,
 ] interface Text : CharacterData {
-    [RaisesException] Text splitText(unsigned long offset);
+    [NewObject, RaisesException] Text splitText(unsigned long offset);
     [MeasureAs=TextWholeText] readonly attribute DOMString wholeText;
 
     // FIXME: Text.getDestinationInsertionPoints() is not in the Shadow DOM spec.
     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=28069
     NodeList getDestinationInsertionPoints();
 };