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The RETURN_IF_XR_FAILED macro previously required a local variable to
already exist for it to function correctly. This change removes that
requirement.

Change-Id: Ib0ebb5855abfe8788f906235d2bec95b13eb6655
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934394
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721069}