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Convert OpenXR test static variables to constexpr according to the code
style guide.

Bug: 1027794
Change-Id: Ic915a14d85df8f65baba3e363a9827b28f14bb46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1957130Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Zheng Qin <zheqi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#723511}