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Removed some now-unneeded Mac- and Linux-related test suite
exceptions. There are no changes to the generated waterfalls.

Bug: 833020
Change-Id: Ia76178134f60fd0c018ef84658d9f0f3ea4390ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585987
Auto-Submit: Kenneth Russell <kbr@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654567}