Add missing copyright on test cases.

pkg/front_end/testcases/micro.dart

Index: pkg/front_end/testcases/micro.dart
diff --git a/pkg/front_end/testcases/micro.dart b/pkg/front_end/testcases/micro.dart
index 910f336e440b5df2985cf391dca732cbc6550397..cfcb2fcc2b394c4b7c2e7c7482f7fcd20ee58ec1 100644
--- a/pkg/front_end/testcases/micro.dart
+++ b/pkg/front_end/testcases/micro.dart
@@ -1,3 +1,7 @@
+// 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.
+
 staticMethod() {
   return "sdfg";
 }