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This was previously used as a condition instead of a DCHECK because of
crbug.com/1107269.

Bug: 1107269
Change-Id: I16c814fb60b40bb508c8fa43fa91f41b27feb5af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359970
Auto-Submit: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Charlie Reis <creis@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799260}