afdo_bisection: remove absl dependency

absl isn't available outside of the chroot, which makes using this
script pretty difficult in some cases. The dependency isn't necessary
(we only care for flags), and it's probably better if we parameterize
functions/objects on the things they depend on, rather than having them
reach into FLAGS.

BUG=None
TEST=Ran the tests

Change-Id: Ic535b92ce580071ab5a346cde76f201941a748ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1839618
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
2 files changed