cros: Update design of encryption migration UI for ext4 dircrypto.

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 "base/macros.h"
 #include "chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
@@ skipping 25 matching lines @@
       ::login::LocalizedValuesBuilder* builder) override;
   void Initialize() override;
 
  private:
   // Enumeration for the migration state. These values must be kept in sync with
   // EncryptionMigrationUIState in JS code.
   enum UIState {
     INITIAL = 0,
     READY = 1,
     MIGRATING = 2,
-    MIGRATION_SUCCEEDED = 3,
-    MIGRATION_FAILED = 4,
-    NOT_ENOUGH_STORAGE = 5,
+    MIGRATION_FAILED = 3,
+    NOT_ENOUGH_STORAGE = 4,
   };
 
   // WebUIMessageHandler implementation:
   void RegisterMessages() override;
 
   // PowerManagerClient::Observer implementation:
   void PowerChanged(const power_manager::PowerSupplyProperties& proto) override;
 
   // Handlers for JS API callbacks.
   void HandleStartMigration();
@@ skipping 39 matching lines @@
   bool should_migrate_on_enough_battery_ = false;
 
   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_