This most likely only affects users with DEPOT_TOOLS_WIN_TOOLCHAIN=0. I'm also not sure if it affects Chromium as I think it no longer uses anything from the toolchain. It does however affect ANGLE and Dawn as they both use MSVC.

If the user has multiple toolchain directories the script will pick the first it finds. It might not be the correct one to use. A good idea would be to pick the most recent/highest version number if there are more than one.

Issue reported by Markus from NVIDIA.