[Sync] Refactor passphrase state handling

sync/test/fake_sync_encryption_handler.h

 // Copyright (c) 2012 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 SYNC_SYNCABLE_TEST_FAKE_SYNC_ENCRYPTION_HANDLER_H_
 #define SYNC_SYNCABLE_TEST_FAKE_SYNC_ENCRYPTION_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 19 matching lines @@
 
   // SyncEncryptionHandler implementation.
   virtual void AddObserver(Observer* observer) OVERRIDE;
   virtual void RemoveObserver(Observer* observer) OVERRIDE;
   virtual void Init() OVERRIDE;
   virtual void SetEncryptionPassphrase(const std::string& passphrase,
                                        bool is_explicit) OVERRIDE;
   virtual void SetDecryptionPassphrase(const std::string& passphrase) OVERRIDE;
   virtual void EnableEncryptEverything() OVERRIDE;
   virtual bool EncryptEverythingEnabled() const OVERRIDE;
-  virtual bool IsUsingExplicitPassphrase() const OVERRIDE;
+  virtual PassphraseState GetPassphraseState() const OVERRIDE;
 
   // NigoriHandler implemenation.
   virtual void ApplyNigoriUpdate(
       const sync_pb::NigoriSpecifics& nigori,
       syncable::BaseTransaction* const trans) OVERRIDE;
   virtual void UpdateNigoriFromEncryptedTypes(
       sync_pb::NigoriSpecifics* nigori,
       syncable::BaseTransaction* const trans) const OVERRIDE;
   virtual ModelTypeSet GetEncryptedTypes(
       syncable::BaseTransaction* const trans) const OVERRIDE;
 
   Cryptographer* cryptographer() { return &cryptographer_; }
 
  private:
   ObserverList<SyncEncryptionHandler::Observer> observers_;
   ModelTypeSet encrypted_types_;
   bool encrypt_everything_;
-  bool explicit_passphrase_;
+  PassphraseState passphrase_state_;
 
   FakeEncryptor encryptor_;
   Cryptographer cryptographer_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_TEST_FAKE_SYNC_ENCRYPTION_HANDLER_H_