The previous interactions were incorrect w.r.t. scm.GIT's config cache. This moves depot_tools towards having one fewer git wrapper (converging towards scm.GIT). R=ayatane, yiwzhang@google.com Change-Id: I507628b53f6a87a1eecbbe3e1e27c1eb6af3b878 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5648617 Auto-Submit: Robbie Iannucci <iannucci@chromium.org> Reviewed-by: Yiwei Zhang <yiwzhang@google.com> Commit-Queue: Yiwei Zhang <yiwzhang@google.com>