Replace RE2 import with a dependency

third_party/re2/CONTRIBUTORS

-# This is the official list of people who can contribute
-# (and typically have contributed) code to the RE2 repository.
-# The AUTHORS file lists the copyright holders; this file
-# lists people.  For example, Google employees are listed here
-# but not in AUTHORS, because Google holds the copyright.
-#
-# The submission process automatically checks to make sure
-# that people submitting code are listed in this file (by email address).
-#
-# Names should be added to this file only after verifying that
-# the individual or the individual's organization has agreed to
-# the appropriate Contributor License Agreement, found here:
-#
-#     http://code.google.com/legal/individual-cla-v1.0.html
-#     http://code.google.com/legal/corporate-cla-v1.0.html
-#
-# The agreement for individuals can be filled out on the web.
-#
-# When adding J Random Contributor's name to this file,
-# either J's name or J's organization's name should be
-# added to the AUTHORS file, depending on whether the
-# individual or corporate CLA was used.
-
-# Names should be added to this file like so:
-#     Name <email address>
-
-# Please keep the list sorted.
-
-Dominic Battré <battre@chromium.org>
-Doug Kwan <dougkwan@google.com>
-Dmitriy Vyukov <dvyukov@google.com>
-John Millikin <jmillikin@gmail.com>
-Mike Nazarewicz <mpn@google.com>
-Nico Weber <thakis@chromium.org>
-Pawel Hajdan <phajdan.jr@gmail.com>
-Rob Pike <r@google.com>
-Russ Cox <rsc@swtch.com>
-Sanjay Ghemawat <sanjay@google.com>
-Stefano Rivera <stefano.rivera@gmail.com>
-Srinivasan Venkatachary <vsri@google.com>
-Viatcheslav Ostapenko <sl.ostapenko@samsung.com>