Remove branch redirect support in git_cl
Remove branch redirect support in git_cl

Gob already supports branch redirect so we no longer need this in
depot_tools.

R=bdcbd10822f2f5deecea3bf14d73e9025b1b8375@google.com

Change-Id: I0e697b022dc132bc5cba95e1b1746c0d72fe16aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3137816
Auto-Submit: Josip Sokcevic <4606aec58cba917397ff2e4738f995e4758694f8@google.com>
Reviewed-by: Gavin Mak <bdcbd10822f2f5deecea3bf14d73e9025b1b8375@google.com>
Commit-Queue: Josip Sokcevic <4606aec58cba917397ff2e4738f995e4758694f8@google.com>

CoherentLabs/depot_tools,CoherentLabs/depot_tools