Re-land "Format all multitests"

tests/language/generic_metadata_test.dart

 // Copyright (c) 2016, 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 annotations cannot use type arguments, but can be raw.
 
 class C<T> {
   const C();
 }
 
 @C() //         //# 01: ok
 @C<dynamic>() //# 02: compile-time error
 @C<int>() //    //# 03: compile-time error
-main() {}
+main() {}