Revert preparser duplicate detection.

test/preparser/duplicate-parameter.pyt

-# Copyright 2011 the V8 project authors. All rights reserved.
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-# modification, are permitted provided that the following conditions are
-# met:
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-#       contributors may be used to endorse or promote products derived
-#       from this software without specific prior written permission.
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-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# Templatated tests with duplicate parameter names.
-
-# ----------------------------------------------------------------------
-# Constants and utility functions
-
-# A template that performs the same strict-mode test in different
-# scopes (global scope, function scope, and nested function scope),
-# and in non-strict mode too.
-def DuplicateParameterTest(name, source):
-  expectation = "strict_param_dupe"
-  non_selfstrict = {"selfstrict":"", "id":"selfnormal"}
-
-  Template(name, '"use strict";\n' + source)(non_selfstrict, expectation)
-  Template(name + '-infunc',
-           'function foo() {\n "use strict";\n' + source +'\n}\n')(
-               non_selfstrict, expectation)
-  Template(name + '-infunc2',
-           'function foo() {\n "use strict";\n  function bar() {\n' +
-           source +'\n }\n}\n')(non_selfstrict, expectation)
-
-  selfstrict = {"selfstrict": "\"use strict\";", "id": "selfstrict"}
-  nestedstrict = {"selfstrict": "function bar(){\"use strict\";}",
-                  "id": "nestedstrict"}
-  selfstrictnestedclean = {"selfstrict": """
-      "use strict";
-      function bar(){}
-    """, "id": "selfstrictnestedclean"}
-  selftest = Template(name + '-$id', source)
-  selftest(selfstrict, expectation)
-  selftest(selfstrictnestedclean, expectation)
-  selftest(nestedstrict, None)
-  selftest(non_selfstrict, None)
-
-
-# ----------------------------------------------------------------------
-# Test templates
-
-DuplicateParameterTest("dups", """
-  function foo(a, a) { $selfstrict }
-""");
-
-DuplicateParameterTest("dups-apart", """
-  function foo(a, b, c, d, e, f, g, h, i, j, k, l, m, n, a) { $selfstrict }
-""");
-
-DuplicateParameterTest("dups-escaped", """
-  function foo(\u0061, b, c, d, e, f, g, h, i, j, k, l, m, n, a) { $selfstrict }
-""");
-
-DuplicateParameterTest("triples", """
-  function foo(a, b, c, d, e, f, g, h, a, i, j, k, l, m, n, a) { $selfstrict }
-""");
-
-DuplicateParameterTest("escapes", """
-  function foo(a, \u0061) { $selfstrict }
-""");
-
-DuplicateParameterTest("long-names", """
-  function foo(arglebargleglopglyfarglebargleglopglyfarglebargleglopglyfa,
-               arglebargleglopglyfarglebargleglopglyfarglebargleglopglyfa) {
-    $selfstrict
-  }
-""");