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The notion of a simple "size" for Stage Parameters/bounded was a WebVr
concept that did not carry over to WebXr.  To simplify the mojom, move
the "conversion" of square stages (for those runtimes that only support
giving size x/z) down into a utility function in the device process.

Bug: 1017843
Change-Id: Ib050a7ea3655a3816f6008e82434435ecb2c4426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918037
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718364}