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Add not null annotation to all types.

Change indentation to accommodate change.

Bug: b:162051831
Change-Id: I6c4ddc44733b46e5d09526eb073a41d3acab28b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350422Reviewed-by: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Mahmoud Gawad <mgawad@google.com>
Commit-Queue: Laurențiu Olteanu <lolteanu@google.com>
Cr-Commit-Position: refs/heads/master@{#813163}