Speculative fix for flaky leak
single-touch-vertical-rl.html created a promise via
test_driver.Actions.send() but did not wait for it to be resolved.
This might have led to the flaky leaks seen in the linked bug.
We can look at the history[1] after landing this to see if we can
remove the TestExpectations entry[2].
[1]https://ci.chromium.org/ui/test/chromium%3Aci/ninja%3A%2F%2F%3Ablink_wpt_tests%2Fexternal%2Fwpt%2Ftouch-events%2Fsingle-touch-vertical-rl.html?q=VHASH%3A402a4a508f2b5677
Bug: 40861680
Change-Id: I3fe2e32993689295d97344b88e11837c3a60c97c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5630365
Reviewed-by: Kevin Ellis kevers@chromium.org
Commit-Queue: David Awogbemila awogbemila@chromium.org
Cr-Commit-Position: refs/heads/main@{#1316561}