cros: Mount the existing eCryptfs vault to start migration.

chromeos/dbus/mock_cryptohome_client.h

Index: chromeos/dbus/mock_cryptohome_client.h
diff --git a/chromeos/dbus/mock_cryptohome_client.h b/chromeos/dbus/mock_cryptohome_client.h
index 4b4dde46ef14d45ccd9b111f9e9b01d821f3fdf4..549e9a827b0b72474da2f733a4ff3c6317323a8f 100644
--- a/chromeos/dbus/mock_cryptohome_client.h
+++ b/chromeos/dbus/mock_cryptohome_client.h
@@ -222,9 +222,8 @@ class MockCryptohomeClient : public CryptohomeClient {
       FlushAndSignBootAttributes,
       void(const cryptohome::FlushAndSignBootAttributesRequest& request,
            const ProtobufMethodCallback& callback));
-  MOCK_METHOD3(MigrateToDircrypto,
+  MOCK_METHOD2(MigrateToDircrypto,
                void(const cryptohome::Identification& cryptohome_id,
-                    const cryptohome::AuthorizationRequest& auth,
                     const VoidDBusMethodCallback& callback));
   MOCK_METHOD1(SetDircryptoMigrationProgressHandler,
                void(const DircryptoMigrationProgessHandler& handler));