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This CL converts XRPresentationProvider{Ptr, Request} in chrome,
device and blink to the new Mojo type, and uses
pending_remote<XRPresentationProvider> in vr_service.mojom.

Bug: 955171, 978694
Change-Id: Ie24ea65e18797f6371e6ddd79618044260e646c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828758
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702376}