Revert "Disable failing WebXR tests"

This reverts commit 4a2f6274a5b91d1bcba93db4ee5756c6e6de5255.

Reason for revert: Reverted the CL causing failures, so re-enabling tests.

Original change's description:
> Disable failing WebXR tests
> 
> Disables failing WebXR tests that are causing CQ issues. Will be
> re-enabled once the root cause is found and fixed.
> 
> TBR=billorr@chromium.org
> 
> Bug: 913161
> Change-Id: If50af30cc9e24ce917989a0b0ac210254ce503bb
> Reviewed-on: https://chromium-review.googlesource.com/c/1372540
> Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
> Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#615670}

TBR=bsheedy@chromium.org,billorr@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 913161
Change-Id: I309819ee2a135d8ec30cc424726daf4a4fa15a2f
Reviewed-on: https://chromium-review.googlesource.com/c/1377489
Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616760}
2 files changed