Rewrite negative const tests into a few multi tests.

tests/language/src/ConstInitNegativeTest.dart

Index: tests/language/src/ConstInitNegativeTest.dart
diff --git a/tests/language/src/ConstInitNegativeTest.dart b/tests/language/src/ConstInitNegativeTest.dart
deleted file mode 100644
index f218ab3fb7a162e7191165df3a221a16a98e6f4f..0000000000000000000000000000000000000000
--- a/tests/language/src/ConstInitNegativeTest.dart
+++ /dev/null
@@ -1,16 +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 initializer is expected after final variable declaration.
-
-class ConstInitNegativeTest {
-  static testMain() {
-    final int c0 = 5;
-    final int c1;
-    Expect.equals(c0, 5);
-  }
-}
-
-main() {
-  ConstInitNegativeTest.testMain();
-}