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Updates webxr_test_asserts with chromium's more verbose asserts for
easier debugging of tests, and removes the asserts from xr-test-utils
so that all asserts can be referenced from webxr_test_asserts.

Bug: 985156
Change-Id: Ie8d2ca70dd18a7e1759fe2b4d83b02076fcf91c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715916
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680180}