Switch Windows to VS 2019 toolchain (#339) (#392)
Switch Windows to VS 2019 toolchain (#339) (#392)

Mirrors the change from https://chromium.googlesource.com/chromium/src/+/8e82c6ab1bc2223fa25f1a127b65071d2d58ae36%5E%21/

Part of fix for https://github.com/flutter/flutter/issues/48831
flutter/buildroot,flutter/buildroot,flutter/buildroot,flutter/buildroot