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The motivation for this change is FragmentPagerAdapter being deprecated.

BUG=1162839

Binary-size: viewpager2 already in internal Chrome build
Change-Id: If223fdea7ec5003681d4183ad764314b18c83d64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605476
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842829}