Fix ThirdPartyConflictsManager tests on win 8 or lower

Bug: 852295
Change-Id: I09e0bf24f6206d4f320a58795281e42639505e1c
Reviewed-on: https://chromium-review.googlesource.com/1155101
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579395}
4 files changed