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This CL replaces the PreferenceFragmentCompat and
PreferenceDialogFragmentCompat classes in the AndroidX preference
library with the version from master, which has a change needed for
WebLayer. The preference library maintainers say they won't create a new
release just for this fix, so to get it we'll have to pull it in
ourselves.

Bug: 1092986
Change-Id: I0e1c936f6372cb541cabfa29c2aea0d0ee7225fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253029
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802334}