Special casing windows for VR orientation device

Chrome for windows does not support the relative orientation sensor, so
if we are on windows, use the absolute sensor.

Bug: 820308
Change-Id: I3630ae8417839d94bedf8901b4f1509ed8e071d0
Reviewed-on: https://chromium-review.googlesource.com/1050372
Commit-Queue: Anna Offenwanger <[email protected]>
Reviewed-by: Bill Orr <[email protected]>
Cr-Commit-Position: refs/heads/master@{#557947}
4 files changed