cros: Remove user directory when encryption migration fails.

chrome/browser/ui/webui/chromeos/login/encryption_migration_screen_handler.h

 // Copyright 2017 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 CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENCRYPTION_MIGRATION_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENCRYPTION_MIGRATION_SCREEN_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 59 matching lines @@
 
   void CheckAvailableStorage();
   void OnGetAvailableStorage(int64_t size);
   void WaitBatteryAndMigrate();
   void StartMigration();
   void OnMountExistingVault(bool success,
                             cryptohome::MountError return_code,
                             const std::string& mount_hash);
   void StartBlockingPowerSave();
   void StopBlockingPowerSave();
+  // Removes cryptohome and shows the error screen after the removal finishes.
+  void RemoveCryptohome();
+  void OnRemoveCryptohome(bool success, cryptohome::MountError return_code);
 
   // Creates authorization key for MountEx method using |user_context_|.
   cryptohome::KeyDefinition GetAuthKey();
 
   // Handlers for cryptohome API callbacks.
   void OnMigrationProgress(cryptohome::DircryptoMigrationStatus status,
                            uint64_t current,
                            uint64_t total);
   void OnMigrationRequested(bool success);
 
@@ skipping 23 matching lines @@
   std::unique_ptr<device::PowerSaveBlocker> power_save_blocker_;
 
   base::WeakPtrFactory<EncryptionMigrationScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EncryptionMigrationScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENCRYPTION_MIGRATION_SCREEN_HANDLER_H_