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Reducing the shard size when we only have 3 devices for this builder.

Bug: chromium:1152120
Change-Id: I0188d35af9a249e7356c7d02bc2820c64860cc3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559224
Commit-Queue: John Chen <johnchen@chromium.org>
Auto-Submit: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831025}