Add another @Nullable annotation that was suggested by [RedundantNullCheck](https://errorprone.info/bugpattern/RedundantNullCheck) in the mainline.
#8116
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Add another
@Nullableannotation that was suggested byRedundantNullCheckin the mainline.It was already present in the backport since a75d0f0.
Also, resolve some other unnecessary differences between the mainline and backport (also from that CL).
RELNOTES=n/a