Move Script constructor off js builtins object.

src/js/messages.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // -------------------------------------------------------------------
 
 var MakeError;
 var MakeEvalError;
 var MakeRangeError;
 var MakeReferenceError;
@@ skipping 25 matching lines @@
     utils.ImportNow("formatted_stack_trace_symbol");
 var FunctionSourceString
 var GlobalObject = global.Object;
 var Int16x8ToString;
 var Int32x4ToString;
 var Int8x16ToString;
 var InternalArray = utils.InternalArray;
 var internalErrorSymbol = utils.ImportNow("internal_error_symbol");
 var ObjectDefineProperty;
 var ObjectToString;
+var Script = utils.ImportNow("Script");
 var stackTraceSymbol = utils.ImportNow("stack_trace_symbol");
 var StringCharAt;
 var StringIndexOf;
 var StringSubstring;
 var SymbolToString;
 var Uint16x8ToString;
 var Uint32x4ToString;
 var Uint8x16ToString;
 
 utils.Import(function(from) {
@@ skipping 982 matching lines @@
   "to_detail_string_fun", ToDetailString,
   "type_error_function", GlobalTypeError,
   "uri_error_function", GlobalURIError,
 ]);
 
 utils.Export(function(to) {
   to.ErrorToString = ErrorToString;
 });
 
 });