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The calls to BelongsToCurrentThread appear to be no-ops at the moment, and
assume that they were intended to be DCHECKS, so a quick CL to fix.

Change-Id: I33a6c8e05312b528d5a4e89fd18a0cff6281cd28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762238
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720592}