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Reference build has been disabled everywhere on perf waterfall. This CL removes the footprints of it in the sharding logic.

Bug: chromium:1130157
Change-Id: If64f8435f705710305a0c6fe24610ceac7cf6275
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451514
Auto-Submit: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814359}