cryptohome: Make CryptohomeClient::Unmount non-blocking

chromeos/dbus/fake_cryptohome_client.h

 // Copyright 2013 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 CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 14 matching lines @@
 
   void Init(dbus::Bus* bus) override;
   void SetAsyncCallStatusHandlers(
       const AsyncCallStatusHandler& handler,
       const AsyncCallStatusWithDataHandler& data_handler) override;
   void ResetAsyncCallStatusHandlers() override;
   void SetLowDiskSpaceHandler(const LowDiskSpaceHandler& handler) override;
   void WaitForServiceToBeAvailable(
       const WaitForServiceToBeAvailableCallback& callback) override;
   void IsMounted(const BoolDBusMethodCallback& callback) override;
-  bool Unmount(bool* success) override;
+  void Unmount(const BoolDBusMethodCallback& callback) override;
   void AsyncCheckKey(const cryptohome::Identification& cryptohome_id,
                      const std::string& key,
                      const AsyncMethodCallback& callback) override;
   void AsyncMigrateKey(const cryptohome::Identification& cryptohome_id,
                        const std::string& from_key,
                        const std::string& to_key,
                        const AsyncMethodCallback& callback) override;
   void AsyncRemove(const cryptohome::Identification& cryptohome_id,
                    const AsyncMethodCallback& callback) override;
   void RenameCryptohome(const cryptohome::Identification& cryptohome_id_from,
@@ skipping 219 matching lines @@
   uint64_t dircrypto_migration_progress_;
 
   base::WeakPtrFactory<FakeCryptohomeClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeCryptohomeClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_