Follow-up for4ea8b443de. The logic that manages DnsQueryCandidate is rather complicated: a calls to dns_query_complete() that wants to destroy a DnsQueryCandidate can be nested inside a deep chain of calls. Using reference counts seems like the simplest approach. DnsSearchDomain already uses reference counting. This patch effectively brings dns_query_candidate_go() to the state before4ea8b443de, but wraps the iteration over DnsQueryCandidate.transactions in dns_query_candidate_ref+dns_query_candidate_unref.
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