test rename overhaul: step 8 - language tests

tests/language/src/ConstructorDuplicateInitializersTest.dart

-// Copyright (c) 2011, 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.
-// Check that initializers are not duplicated
-
-
-class Class {
-  Class(var v)
-    : field_ = v
-      // Test against duplicate final field initializaion in initializing list.
-    , field_ = 2  /// 01: compile-time error
-  ;
-  Class.field(this.field_)
-      // Test against duplicate final field initialization between initializing
-      // formals and initializer list.
-    : field_ = 2  /// 02: compile-time error
-  ;
-  final field_;
-}
-
-main() {
-  new Class(42);
-  new Class.field(42);
-}