Clean up logic re: virtualized contexts and passthrough

This logic was being duplicated on Mac because of an earlier change.

Bug: chromium:914976
Change-Id: I724c3447f9ed50c54e0e448e994a74f693f05168
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316150
Reviewed-by: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Cr-Original-Commit-Position: refs/heads/master@{#791869}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a602b394401de7c5e08c38496c64caa5fc82a0c5
1 file changed