Mark virtual/audio-service/http/tests/media/video-frame-size-change.html as flaky

Test is still flaky after attempted fix unfortunately.

TBR=chcunningham@chromium.org

Bug: 993671
Change-Id: Ic0be02c94be122a474d4702664b5c897d9725aaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752574
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686742}
1 file changed