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The web platform test xhr/responsexml-document-properties.htm is flaky.
Mark it as such in TestExpectations.

BUG=1144537

Change-Id: Ic7de8bb61f7646127c4094a9f88c066895189b6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515419
Commit-Queue: Adam Rice <ricea@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Auto-Submit: Adam Rice <ricea@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823371}