Tidy up DFA deletion while fixing an error from MSVC.

Fixes #79.

Change-Id: I7d3f7d9b9825e3bcb84bcb1d0f58ba29650026d1
Reviewed-on: https://code-review.googlesource.com/4234
Reviewed-by: Paul Wankadia <junyer@google.com>
3 files changed