tree 69eb7120870aa598e7cfc4f790520e066bb32144
parent b049f8e28b8f0a5ace7ad3bf23bce802bd934bf5
author Paul Wankadia <junyer@google.com> 1552899619 -0700
committer Paul Wankadia <junyer@google.com> 1552899776 +0000

Get rid of `using std::string;`. (part 6 of N)

Change-Id: Ib035703780c88764b952ac09421a0e0524fc00ec
Reviewed-on: https://code-review.googlesource.com/c/re2/+/39134
Reviewed-by: Paul Wankadia <junyer@google.com>