Allow CertNetFetcher to be shutdown from the network thread

net/cert/internal/cert_issuer_source_aia.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/internal/cert_issuer_source_aia.h"
 
 #include "base/bind.h"
 #include "net/cert/cert_net_fetcher.h"
 #include "net/cert/internal/cert_errors.h"
 #include "url/gurl.h"
@@ skipping 75 matching lines @@
     LOG(ERROR) << "Error parsing cert retrieved from AIA:\n"
                << errors.ToDebugString();
     return false;
   }
 
   return true;
 }
 
 }  // namespace
 
-CertIssuerSourceAia::CertIssuerSourceAia(CertNetFetcher* cert_fetcher)
-    : cert_fetcher_(cert_fetcher) {}
+CertIssuerSourceAia::CertIssuerSourceAia(
+    scoped_refptr<CertNetFetcher> cert_fetcher)
+    : cert_fetcher_(std::move(cert_fetcher)) {}
 
 CertIssuerSourceAia::~CertIssuerSourceAia() = default;
 
 void CertIssuerSourceAia::SyncGetIssuersOf(const ParsedCertificate* cert,
                                            ParsedCertificateList* issuers) {
   // CertIssuerSourceAia never returns synchronous results.
 }
 
 void CertIssuerSourceAia::AsyncGetIssuersOf(const ParsedCertificate* cert,
                                             std::unique_ptr<Request>* out_req) {
@@ skipping 36 matching lines @@
     // that this doesn't need to wait for async callback just to tell that an
     // URL has an unsupported scheme?
     aia_request->AddCertFetcherRequest(cert_fetcher_->FetchCaIssuers(
         url, kTimeoutMilliseconds, kMaxResponseBytes));
   }
 
   *out_req = std::move(aia_request);
 }
 
 }  // namespace net