WIP: NSS trust store integration for path builder.

net/cert/internal/cert_issuer_source_aia.cc

Index: net/cert/internal/cert_issuer_source_aia.cc
diff --git a/net/cert/internal/cert_issuer_source_aia.cc b/net/cert/internal/cert_issuer_source_aia.cc
index 5ee96a07831110187e2023ff02fe5219e69ce6e1..942b6fc1a7ff45e6c6d4aff818b67de1b5e16edb 100644
--- a/net/cert/internal/cert_issuer_source_aia.cc
+++ b/net/cert/internal/cert_issuer_source_aia.cc
@@ -99,6 +99,7 @@ void AiaRequest::OnFetchCompleted(Error error,
   //    stop waiting.)
   if (client_waiting_for_callback && (HasNext() || pending_requests_ == 0))
     issuers_callback_.Run(this);
+  // |this| may be deleted here.
 }
 
 }  // namespace
@@ -114,7 +115,7 @@ void CertIssuerSourceAia::SyncGetIssuersOf(const ParsedCertificate* cert,
 }
 
 void CertIssuerSourceAia::AsyncGetIssuersOf(
-    const ParsedCertificate* cert,
+    scoped_refptr<ParsedCertificate> cert,
     const IssuerCallback& issuers_callback,
     std::unique_ptr<Request>* out_req) {
   out_req->reset();