Include util/thread.h before util/test.h in re2/testing/dfa_test.cc.

Fixes #57.

Change-Id: I4197bc130432634deb3f94dd22b2cd055c2c5d0c
Reviewed-on: https://code-review.googlesource.com/3563
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed