Update expectation of terminate-during-sync-operation-websql.html.

Blink r180546 fixed a crash issue. We still see flaky timeout.  See if Making
Slow will resolve the flakiness.

BUG=347902,357427
TBR=oilpan-reviews@chromium.org

Review URL: https://codereview.chromium.org/494463002

git-svn-id: svn://svn.chromium.org/blink/trunk@180606 bbb929c8-8fbe-4397-9dbb-9b2b20218538