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For a nested class use BEGIN_NESTED_METADATA(outer_class, class_name, parent_class_name)

The use of the other macros remain the same.

Bug: 1166802
Change-Id: I125dce952969d529e0277559ab739ef89bae9afa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631607Reviewed-by: Wei Li <weili@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846185}