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Enables OpenXR as a default VR backend.

Change-Id: I620c01a7a674c32874a83d2551f4b1c94663b746
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001581Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Lachlan Ford <laford@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#736195}