Rewrite negative const tests into a few multi tests.

tests/language/src/ConstInit7NegativeTest.dart

Index: tests/language/src/ConstInit7NegativeTest.dart
diff --git a/tests/language/src/ConstInit7NegativeTest.dart b/tests/language/src/ConstInit7NegativeTest.dart
deleted file mode 100644
index 06fd96a7c6f4aff0b68098c2d3bee3d30894835c..0000000000000000000000000000000000000000
--- a/tests/language/src/ConstInit7NegativeTest.dart
+++ /dev/null
@@ -1,18 +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 a method reference is not an acceptable compile time constant
-// VMOptions=
-// VMOptions=--compile_all
-
-topMethod() { }
-
-class ConstInit7NegativeTest {
-  classMethod([var x = 
-    topMethod // Error: not a compile time const.
-  ]) {}
-}
-
-main() {
- (new ConstInit7NegativeTest()).classMethod();
-}