Rename 'ScalarValueString' to 'USVString' to match Web IDL

Source/core/dom/URL.idl

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2012 Motorola Mobility Inc.
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 // http://url.spec.whatwg.org/#url
 
 [
-    Constructor(ScalarValueString url),
-    Constructor(ScalarValueString url, ScalarValueString base),
-    Constructor(ScalarValueString url, URL base),
+    Constructor(USVString url),
+    Constructor(USVString url, USVString base),
+    Constructor(USVString 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] static DOMString? createObjectURL(Blob? blob);
     [CallWith=ExecutionContext] static void revokeObjectURL(DOMString url);
 };
 
 URL implements URLUtils;