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This allows the use of, e.g.: CHECK_EQ(), making error messages clearer.

Change-Id: I0d087117e3da0cafc792ea7baa78c89febcec4ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463281Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Tal Pressman <talp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816354}