Migrate block 163 to Dart 2.0.

tests/language_2/variable_declaration_metadata_test.dart

 // Copyright (c) 2015, 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.
 
 // Verify that the individual variable declarations inside a variable
 // declaration list are not allowed to be annotated with metadata.
 
 const annotation = null;
 
 var
@@ skipping 66 matching lines @@
   for (int
          @annotation //# 15: compile-time error
       i3 = 0,
          @annotation //# 16: compile-time error
       i4 = 0;;) {
     use(i3);
     use(i4);
     break;
   }
 }