Move tests {list,map}_literals_can_infer_null_top_level to inference_new

pkg/front_end/testcases/inference/list_literals_can_infer_null_top_level.dart

Index: pkg/front_end/testcases/inference/list_literals_can_infer_null_top_level.dart
diff --git a/pkg/front_end/testcases/inference/list_literals_can_infer_null_top_level.dart b/pkg/front_end/testcases/inference/list_literals_can_infer_null_top_level.dart
deleted file mode 100644
index 3b2d7dfd11434e5c7342d41238bc14e1a269b052..0000000000000000000000000000000000000000
--- a/pkg/front_end/testcases/inference/list_literals_can_infer_null_top_level.dart
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2017, 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.
-
-/*@testedFeatures=inference*/
-library test;
-
-var /*@topType=List<dynamic>*/ x = /*@typeArgs=dynamic*/ [null];
-
-main() {
-  x;
-}