Disable flaky CopyBetweenWindows test

Bug: 911824, 911609
Change-Id: I0265f663858a42b67f1cab2f1aca07dffab27497
Tbr: amistry@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1362290
Reviewed-by: Ovidio Henriquez <odejesush@chromium.org>
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613760}
1 file changed