[nobuildbot] Rename Win bots back to Win8/Win10

BUG=skia:

Change-Id: If66bdfc6cf15e11129048ee748430c3887132b75
Reviewed-on: https://skia-review.googlesource.com/5351
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed