Before:
  option (MyProto.options) = {
    field_c : "OK" msg_field{field_d : 123}
  };

After:
  option (MyProto.options) = {
    field_c : "OK"
    msg_field{field_d : 123}
  };

(Note that the colon after "msg_field" is optional).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215692 91177308-0d34-0410-b5e6-96231b3b80d8