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The motivation for the migration is that FragmentStatePagerAdapter is
deprecated.

BUG=1162839

Change-Id: I600ef392633b9c75cf1b11a6e56a862a685f7c6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611949
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Reviewed-by: Wenyu Fu <wenyufu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843402}