VERIFY_HEAP does not necessarily imply DEBUG.

Bug: chromium:694255
TRB: mlippautz@chromium.org
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I1699288bd9d826ea1d577dd4fc2de81ee450add7
Reviewed-on: https://chromium-review.googlesource.com/618892
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47410}