Make CertificateProviderService vend ClientCertIdentities directly.

chrome/browser/chromeos/net/client_cert_store_chromeos.h

Index: chrome/browser/chromeos/net/client_cert_store_chromeos.h
diff --git a/chrome/browser/chromeos/net/client_cert_store_chromeos.h b/chrome/browser/chromeos/net/client_cert_store_chromeos.h
index 3f66f8b32fc1103275937bb95d4d1577800bf20f..bd40960c9d6ff101600eb2771af5572e9c990b9d 100644
--- a/chrome/browser/chromeos/net/client_cert_store_chromeos.h
+++ b/chrome/browser/chromeos/net/client_cert_store_chromeos.h
@@ -56,13 +56,13 @@ class ClientCertStoreChromeOS : public net::ClientCertStore {
  private:
   void GotAdditionalCerts(const net::SSLCertRequestInfo* request,
                           const ClientCertListCallback& callback,
-                          const net::CertificateList& additional_certs);
+                          net::ClientCertIdentityList additional_certs);
 
   net::ClientCertIdentityList GetAndFilterCertsOnWorkerThread(
       scoped_refptr<crypto::CryptoModuleBlockingPasswordDelegate>
           password_delegate,
       const net::SSLCertRequestInfo* request,
-      const net::CertificateList& additional_certs);
+      net::ClientCertIdentityList additional_certs);
 
   std::unique_ptr<CertificateProvider> cert_provider_;
   std::unique_ptr<CertFilter> cert_filter_;