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This is a temporary CHECK() to help diagnose an existing crash.

The goal is to turn it into a dcheck once the issue is solved.

Bug: 1058705
Change-Id: I985d38759dcbfdd00ccdea896c1630fa925cf35f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097175
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749162}