Report compile time error if named argument is given twice.

tests/language/language_dart2js.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dart2js && $host_checked && $checked]
 new_expression_type_args_test/02: Crash # Issue 6931
 
 [ $compiler == dart2js || $compiler == dart2dart ]
 class_literal_test/01: Fail # Class literals are expression now; delete this test.
 class_literal_test/02: Fail # Class literals are expression now; delete this test.
@@ skipping 121 matching lines @@
 
 compile_time_constant8_test: Fail # We don't take the generic type into account yet.
 canonical_const_test: Fail # We don't take the generic type into account yet.
 
 # Support for optional parameters not conform to latest spec.
 function_type_alias_test: Fail
 function_type_alias2_test: Fail
 named_parameters_type_test: Fail
 positional_parameters_type_test: Fail
 named_parameters_with_object_property_names_test: Fail
-named_parameters_aggregated_test/04: Fail # dart2js issue 5213
 
 # Fail "const EmptyLink<Element>" must be a compile-time constant if unchecked on linux.
 # Crash infinite loop on Mac and dart2js checked mode on linux.
 function_type_alias6_test: Crash, Fail
 
 
 # Compilation errors.
 default_factory3_test: Fail # type arguments on redirecting factory not implemented
 non_parameterized_factory_test: Fail # type arguments on redirecting factory not implemented
 non_parameterized_factory2_test: Fail # type arguments on redirecting factory not implemented
@@ skipping 214 matching lines @@
 [ $runtime == opera ]
 call_through_null_getter_test: Fail
 closure3_test: Fail
 execute_finally3_test: Fail
 method_invocation_test: Fail
 null_pointer_exception_test: Fail
 stack_overflow_test: Fail
 string_interpolate_npe_test: Fail
 closure_call_wrong_argument_count_negative_test: Skip
 label_test: Skip