Replace c/b/nss_context by a KeyedService.

chromeos/network/onc/onc_certificate_importer_impl.h

Index: chromeos/network/onc/onc_certificate_importer_impl.h
diff --git a/chromeos/network/onc/onc_certificate_importer_impl.h b/chromeos/network/onc/onc_certificate_importer_impl.h
index 899ab58486ff02c19d7b621cda3191a28e7ee464..08c8b0a7e60a95bb2bb2114b3b508afc21efe30d 100644
--- a/chromeos/network/onc/onc_certificate_importer_impl.h
+++ b/chromeos/network/onc/onc_certificate_importer_impl.h
@@ -24,6 +24,10 @@ class SequencedTaskRunner;
 class SingleThreadTaskRunner;
 }
 
+namespace cert_database {
+class CertDatabaseServiceIOPart;
+}
+
 namespace net {
 class NSSCertDatabase;
 class X509Certificate;
@@ -44,7 +48,8 @@ class CHROMEOS_EXPORT CertificateImporterImpl : public CertificateImporter {
   // |io_task_runner| will be used for NSSCertDatabase accesses.
   CertificateImporterImpl(
       const scoped_refptr<base::SequencedTaskRunner>& io_task_runner,
-      net::NSSCertDatabase* target_nssdb_);
+      const base::WeakPtr<cert_database::CertDatabaseServiceIOPart>&
+          cert_db_io);
   virtual ~CertificateImporterImpl();
 
   // CertificateImporter overrides
@@ -103,7 +108,7 @@ class CHROMEOS_EXPORT CertificateImporterImpl : public CertificateImporter {
   scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
 
   // The certificate database to which certificates are imported.
-  net::NSSCertDatabase* target_nssdb_;
+  base::WeakPtr<cert_database::CertDatabaseServiceIOPart> cert_db_io_;
 
   base::WeakPtrFactory<CertificateImporterImpl> weak_factory_;