Switch URL and URLUtils interfaces over to use ScalarValueString.

Source/core/dom/URL.idl

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2012 Motorola Mobility Inc.
  *
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 // http://url.spec.whatwg.org/#url
 
 [
-    Constructor(DOMString url),
-    Constructor(DOMString url, DOMString base),
-    Constructor(DOMString url, URL base),
+    Constructor(ScalarValueString url),
+    Constructor(ScalarValueString url, ScalarValueString base),
+    Constructor(ScalarValueString url, URL base),
     Exposed=Window&Worker,
     ImplementedAs=DOMURL,
     RaisesException=Constructor,
     WillBeGarbageCollected,
 ] interface URL {
     // FIXME: should be in separate URLBlob.idl partial interface definition
     // http://dev.w3.org/2006/webapi/FileAPI/#URL-object
     // FIXME: should not be nullable
     [RaisesException, CallWith=ExecutionContext, TreatReturnedNullStringAs=Null] static DOMString createObjectURL(Blob? blob);
     [CallWith=ExecutionContext] static void revokeObjectURL(DOMString url);
 };
 
 URL implements URLUtils;