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Rename createSyncRoot to createBlockingRoot (#17165)

* Rename createSyncRoot to createBlockingRoot

* Fix up
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Dan Abramov committed
f6b8d31a76cbbcbbeb2f1d59074dfe72e0c82806
Parent: 9c02d26
Committed by GitHub <noreply@github.com> on 10/23/2019, 10:04:39 PM