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Mostly this is missing nullability modifiers picked up by
jscomp_error=lintChecks. Also clean up some white space in closure
annotations.

This just addresses the release code (test code to be done later after
consolidating all the flags better).

Bug: 892530
Change-Id: Ibb8c250bf7b5e3950f9bc477bad0fcffc3254bff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253258Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780090}