Make CHECK int 3 on Windows, rather than crash

Not being able to distinguish intentional crashes (CHECK) from unintentional ones (other access violations) in terms of exit codes reduces the amount of signal we have in stability metrics.

R=wfh@chromium.org
BUG=664209,687326

Review-Url: https://codereview.chromium.org/2676483002
Cr-Commit-Position: refs/heads/master@{#450809}
2 files changed