This reverts commit 18b4479c.

Reason for revert: Breaking WebRTC roller: https://luci-milo.appspot.com/buildbot/client.webrtc.fyi/Auto-roll%20-%20WebRTC%20DEPS/12788

Original change's description:
> gerrit_util: Support OAuth2 bearer tokens in CookieAuthenticator
> 
> Change-Id: I9fd3e2fa9ea16d7f057290e77a81f7009c7c9d91
> Reviewed-on: https://chromium-review.googlesource.com/1221826
> Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
> Commit-Queue: Eric Boren <borenet@chromium.org>

TBR=vadimsh@chromium.org,dnj@chromium.org,borenet@chromium.org,tandrii@chromium.org

Change-Id: I93bbd2d09cd2b27d9a7aa98fc15d60c5033a38cd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1231433Reviewed-by: Eric Boren <borenet@chromium.org>
Commit-Queue: Eric Boren <borenet@chromium.org>