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On 10.14, a file selection dialog whose default path doesn't exist will default
back to ~/Documents, which breaks this test. To avoid this issue, have this
test use /private/var, which is always present.

Bug: 892174
Change-Id: I3f50a74566bdc5a3bf4eb14433138e65d1cfe2d5
Reviewed-on: https://chromium-review.googlesource.com/c/1316109Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606493}