This reverts commit 3774c589.

Reason for revert: https://logs.chromium.org/logs/chromium-m86/led/infra-try-recipes-tester_chops-service-accounts.iam.gserviceaccount.com/ea31a9d6c2b61127e3b98d86fb9bc2b8c6370fa3771701fcaa11b47a2d735c19/+/steps/bot_update/0/stdout Going to revert and test with led before landing another "fix"

Original change's description:
> Reland "Add optional enforce_fetch kwarg to fetch and refresh git cache"
>
> This is a reland of f38f54f2
>
> Original change's description:
> > Add optional enforce_fetch kwarg to fetch and refresh git cache
> >
> > Allows builders to do a force refresh of the git cache to ensure a new
> > fetch happens. android-binary-size needs this to get an accurate diff
> > of the passed in src revision and the applied patch:
> > https://bugs.chromium.org/p/chromium/issues/detail?id=1129235#c19
> >
> > Bug: 1129235
> > Change-Id: I993521cdde2a491fc9d42d75ff28dedcd2cea64e
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2438802
> > Commit-Queue: Stephanie Kim <kimstephanie@google.com>
> > Reviewed-by: Josip Sokcevic <sokcevic@google.com>
>
> Bug: 1129235
> Change-Id: I034a91a8b57821d08b10042f7fc94d32350540ba
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2443235
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Stephanie Kim <kimstephanie@google.com>

TBR=tandrii@google.com,ehmaldonado@chromium.org,infra-scoped@luci-project-accounts.iam.gserviceaccount.com,sokcevic@google.com,kimstephanie@google.com

Change-Id: I305215eed4128b13c9b5b524f4cbf3203037d582
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1129235
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2443573Reviewed-by: Stephanie Kim <kimstephanie@google.com>
Commit-Queue: Stephanie Kim <kimstephanie@google.com>