The original CL was reverted because regression test used i18n stuff,
which was not available in the no-i18n bot.

The regression test turned out to be flaky, because I cannot even
reproduce the crash now without the fix. I think the reason is that for
the crash to happen a stack check has to fail within the rejection of
a promise. Small changes can cause the stack check to fail somewhere
else. Investigations showed though that the crash should still be
possible. I propose therefore to land the fix now without the
regression test.

Original message:
We check that if we do not get a result, or if we get a negative result,
then there has to be a scheduled exception.

R=clemensh@chromium.org
BUG=chromium:704127

Change-Id: Iaf355249686412a636074a476687413b621aac68
Reviewed-on: https://chromium-review.googlesource.com/464846Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44300}