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This value is not used by Blink, and does not need to be communicated
over the mojo interface. The XRDeviceId enum should not be removed
because it is used for usage stats.

Bug: 1017477
Change-Id: I5e8cfff00c374f48495290c5dfb8911a1824a2de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424684Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Auto-Submit: Brandon Jones <bajones@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810958}