Re-enable capture_unittests on WebRTC bots except windows.

The tests are clearly broken on Windows if a webcam is plugged in.
They pass on win10 but only because they're disabled there. See bug
for example breakages on Windows.

Bug: 893494
Change-Id: I8ea43cc4e3ef23082246ff23ec635f2ec5bfbbe2
Reviewed-on: https://chromium-review.googlesource.com/c/1309789
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606038}
3 files changed