Remove DOM prefix from several IDL interfaces

Source/core/dom/shadow/ShadowRoot.idl

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 16 matching lines @@
 [
     NoInterfaceObject,
 ] interface ShadowRoot : DocumentFragment {
     readonly attribute Element activeElement;
     attribute boolean applyAuthorStyles;
     attribute boolean resetStyleInheritance;
 
     [TreatNullAs=NullString, DeliverCustomElementCallbacks, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds, SetterRaisesException] attribute DOMString innerHTML;
 
     [RaisesException] Node cloneNode([Default=Undefined] optional boolean deep);
-    DOMSelection getSelection();
+    Selection getSelection();
     Element getElementById([Default=Undefined] optional DOMString elementId);
     NodeList getElementsByClassName([Default=Undefined] optional DOMString className);
     NodeList getElementsByTagName([Default=Undefined] optional DOMString tagName);
     NodeList getElementsByTagNameNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                     [Default=Undefined] optional DOMString localName);
 
     Element elementFromPoint([Default=Undefined] optional long x, 
                              [Default=Undefined] optional long y);
 };