This reverts commit f38f54f2.

Reason for revert: Seeing errors about missing args https://logs.chromium.org/logs/chromium/led/infra-try-recipes-tester_chops-service-accounts.iam.gserviceaccount.com/007f2e16447b70ae83e87835e2586d4b032f1a915872d9237cec0f72bb239fd6/+/steps/bot_update/0/stdout

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>

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

Change-Id: Ib867742c624f085d3dd56422c2d63c15fdc84f06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1129235
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2443231Reviewed-by: Stephanie Kim <kimstephanie@google.com>
Commit-Queue: Stephanie Kim <kimstephanie@google.com>