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This was enabled only when DCHECK_IS_ON() to assess stability. Enable it
for regular builds as well to assess performance.

Bug: 1125999, 1061437
Change-Id: Ia38c81c95ed0e6ba3fab1754cb4809a08f1fea01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421651Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808942}