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In general dcheck_always_on should catch more bugs. All other platform
builders have set this.

Change-Id: Ibfe62ffba72d4a71bdc570048a999d5e82b931a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386491
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#803934}