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This CL converts TrackedPreferenceValidationDelegatePtr and
TrackedPreferenceValidationDelegateRequest to new Mojo types.

It uses PendingRemote or Remote and ReceiverSet instead of
TrackedPreferenceValidationDelegatePtr and BindingSet.

Bug: 955171
Change-Id: Ia417d64fb7a05fd779795c5eb4c0ba7dbce209b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809288
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698751}