Mark SnapshotBrowserTest.AsyncMultiWindowTest as fail on Linux

BUG=771119
TEST=bot
TBR=sky@chromium.org,kbr@chromium.org

Change-Id: Ie94c3b8cae2359a934cabfdf34139e76471f9367
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798984
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695721}
1 file changed