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This change straightens out some of the convoluted logic in this method,
so that hopefully it is simpler and easier to understand.

Bug: None
Change-Id: I913e98c04c3f9f3a8c6727a25c6c0f4675695c77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877664
Commit-Queue: Lily Chen <chlily@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710884}