Replace c/b/nss_context by a KeyedService.

components/cert_database/public/chromeos/cert_database_service_io_part_chromeos.h

Index: components/cert_database/public/chromeos/cert_database_service_io_part_chromeos.h
diff --git a/components/cert_database/public/chromeos/cert_database_service_io_part_chromeos.h b/components/cert_database/public/chromeos/cert_database_service_io_part_chromeos.h
new file mode 100644
index 0000000000000000000000000000000000000000..978f9f08c9e0736aedb15057b1af5e2d8e1f0832
--- /dev/null
+++ b/components/cert_database/public/chromeos/cert_database_service_io_part_chromeos.h
@@ -0,0 +1,59 @@
+// Copyright 2014 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.
+
+#ifndef COMPONENTS_CERT_DATABASE_PUBLIC_CHROMEOS_CERT_DATABASE_SERVICE_IO_PART_CHROMEOS_h_
+#define COMPONENTS_CERT_DATABASE_PUBLIC_CHROMEOS_CERT_DATABASE_SERVICE_IO_PART_CHROMEOS_h_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
+#include "components/cert_database/public/cert_database_service_io_part.h"
+
+namespace chromeos {
+class CryptohomeClient;
+}
+
+namespace cert_database {
+
+class CertDatabaseServiceIOPartChromeOS : public CertDatabaseServiceIOPart {
+ public:
+  typedef base::Callback<void(bool system_tpm_token_enabled)>
+      SystemTPMTokenReadyCallback;
+
+  CertDatabaseServiceIOPartChromeOS(
+      const std::string& user_email,
+      const std::string& username_hash,
+      bool use_system_key_slot,
+      const base::FilePath& path,
+      const scoped_refptr<base::SequencedTaskRunner>& dbus_task_runner,
+      chromeos::CryptohomeClient* cryptohome_client);
+
+  virtual ~CertDatabaseServiceIOPartChromeOS();
+
+  virtual void Init() override;
+
+  SystemTPMTokenReadyCallback GetSystemTPMTokenReadyCallback();
+
+ protected:
+  virtual void DidCreateNSSCertDatabase(
+      scoped_ptr<net::NSSCertDatabase> db) override;
+
+ private:
+  static void OnSystemTPMTokenReady(
+      const base::WeakPtr<CertDatabaseServiceIOPart>& weak_ptr,
+      CertDatabaseServiceIOPartChromeOS* io_part,
+      bool system_tpm_token_enabled);
+
+  class Internal;
+  scoped_ptr<Internal> internal_;
+
+  DISALLOW_COPY_AND_ASSIGN(CertDatabaseServiceIOPartChromeOS);
+};
+
+}  // namespace cert_database
+
+#endif  // COMPONENTS_CERT_DATABASE_PUBLIC_CHROMEOS_CERT_DATABASE_SERVICE_IO_PART_CHROMEOS_h_