Rewrite the const constructor negative tests into a single multi test.

tests/language/src/ConstConstructor2NegativeTest.dart

Index: tests/language/src/ConstConstructor2NegativeTest.dart
diff --git a/tests/language/src/ConstConstructor2NegativeTest.dart b/tests/language/src/ConstConstructor2NegativeTest.dart
deleted file mode 100644
index e55a09aae58789a2b903a6e25be4a8f88c9c7755..0000000000000000000000000000000000000000
--- a/tests/language/src/ConstConstructor2NegativeTest.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// 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 the const "allocated" class has a const constructor.
-
-class C {
-  C() {}
-}
-
-class ConstConstructor2NegativeTest {
-  static testMain() {
-    var c = const C();  // Error: "const" requires const constructor.
-  }
-}
-main() {
-  ConstConstructor2NegativeTest.testMain();
-}