[infra] Upgrade checked in SDKs to 2.0.0-dev.52.0

TBR=sortie@google.com

Change-Id: I34a986acc5af580463e5ce872c28293d68182613
Reviewed-on: https://dart-review.googlesource.com/53260
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
This commit is contained in:
Alexander Thomas 2018-05-01 19:30:44 +00:00 committed by commit-bot@chromium.org
parent dcf10816aa
commit f044637c8b
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