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before-unload-return-value-from-listener.html is also crashing on the
virtual test suite virtual/mouseevent_fractional with the same reason.

TBR=yutak@chromium.org

Bug: 906952
Change-Id: Ie778939ed40f13d6e1b6e263a6c3266a9427826f
Reviewed-on: https://chromium-review.googlesource.com/c/1358915Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613146}