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If the browser is running in sandboxed mode on win32, only OpenXR
runtimes that support running in an appcontainer should be used.
Runtimes declare this support through the
XR_EXT_win32_appcontainer_compatible extension.

Fixes: 1036527
Change-Id: Ia4d18542439712e1d169b0b54588ab9b47489ef5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979526
Commit-Queue: Lachlan Ford <laford@microsoft.com>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728773}