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We weren't properly checking for backward-compatibility (but were rather
checking for strict equality) of types nested within generics. So if a
stable structure S has a field of type `array<T>` and T is changing in
a backward-compatible way, S would trigger a presubmit failure.

This change corrects the logic here to properly nest such
backward-compatibility checks.

Fixed: 1130671
Change-Id: If739bac2440927fbaf24f7feae5bbd04f9b29c09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422189Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#809541}