Call ActivateBestChain() on every chainstate.
Declared in <validation.h>
[[locks_excluded(0x7f9513c48578), locks_excluded(0x7f9502de9d18), locks_excluded(0x7f950b21c4e8), locks_excluded(0x7f9514bf64d8)]]
util::Result<void>
ActivateBestChains();
A successful result, or an error if activation failed on any chainstate.