Mark web-animations-api/player-cancel-event.html as failing in LeakExpectations
Mark web-animations-api/player-cancel-event.html as failing in LeakExpectations

BUG=588598
TBR=markusheintz,imcheng
NOTRY=true

Review URL: https://codereview.chromium.org/1719023002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376702}

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