[chrome/m79] [infra] Upgrade Win to 2019 Change-Id: I7fbf45f373cf564e3bb88fbb58b60c128e3d06f8 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262148 Reviewed-by: Ravi Mistry <rmistry@google.com> Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>