This reverts commit 5fcb4853.

Reason for revert: Broke Git on my gWindows machine, it fails for many Git operations with the following error message:

git pull                                                                                                    
  2 [main] sh (54140) shared_info::initialize: size of shared memory region changed from 45944 to 38776
fatal: Could not read from remote repository

I've confirmed that reverting this CL fixes the problem.

Original change's description:
> Roll git to 2.27.0 on Windows
> 
> Bug: 1070694
> Change-Id: I37af08864661ca92116776569b9285ceb6ff465c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2300204
> Reviewed-by: Josip Sokcevic <sokcevic@google.com>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

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

Change-Id: I4d27eaa1b17cb056635dceed5ad1562debfc2e06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1070694
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2302489Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>