Revert "Support windows rbe server"

This reverts commit 5d588354df9ab9b677743e591e0ed94a4b463c31.

Reason for revert: This broke engine tree: https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20linux_benchmarks/4196/overview

Original change's description:
> Support windows rbe server
>
> This fixes windows reproxy server start failure: https://ci.chromium.org/ui/p/flutter/builders/try/Windows%20windows_unopt/13868/overview
>
> LED run to validate this CL works: https://ci.chromium.org/raw/build/logs.chromium.org/flutter/led/keyonghan_google.com/602066da45923a403dbce034c28b253806fc6f02b57c9e15097c2153125ed95d/+/build.proto?server=chromium-swarm.appspot.com
>
> Change-Id: I5de27489e8cf3edff19e812dd0095bc909724a00
> Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/53880
> Reviewed-by: Zach Anderson <zra@google.com>
> Reviewed-by: Ricardo Amador <ricardoamador@google.com>
> Commit-Queue: Keyong Han <keyonghan@google.com>

TBR=zra@google.com,keyonghan@google.com,flutter-scoped@luci-project-accounts.iam.gserviceaccount.com,ricardoamador@google.com

Change-Id: I1e80a4215b8a0cf78777928fcaae48583ad6dca3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/53901
Reviewed-by: Keyong Han <keyonghan@google.com>
Commit-Queue: Keyong Han <keyonghan@google.com>
Reviewed-by: Zach Anderson <zra@google.com>