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Changing all the WebXR internal tests to use the test API specified in
https://github.com/immersive-web/webxr-test-api. This will make tests
more maintainable as changes to the backend mocking need only be made
once.

Bug: 863557
Change-Id: I4b8740269c0faa74073ef9294b6b27b78b18715a
Reviewed-on: https://chromium-review.googlesource.com/1136982
Commit-Queue: Anna Offenwanger <offenwanger@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578123}