Gardening: Widen flaky expectations for timeline-event-dispatch.html
Gardening: Widen flaky expectations for timeline-event-dispatch.html

BUG=407915
TBR=eustas@chromium.org

Review URL: https://codereview.chromium.org/627483002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@183155 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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