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and use visibility checks instead of nullness checks.

Bug: 1044038
Change-Id: Ib3283e85559f03810d88e8ab8774214d4931c7f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2236432
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776641}