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Add gpu-fyi-try-win-xr-builder as an alternative.

Drive-by remove non-existent
buildbot/chromium.gpu/Android Release (Nexus 5X)

Bug: 982086, 977735
Change-Id: I30effd28b414ce46df230c9b24305921c8cdb423
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696691Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676613}