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Now that a large bulk of the VRServiceImpl code has moved from chrome/
to content/ adds entries to the corresponding trybots to also run for
the new content/browser/xr directory

Bug: 1031622
Change-Id: If5af861e97cf5e6f88a3a39f47688e64782f579c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135065Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757222}