[Sync] Implement keystore migration support.

sync/internal_api/sync_manager_impl.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_INTERNAL_API_SYNC_MANAGER_H_
 #define SYNC_INTERNAL_API_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 110 matching lines @@
   virtual void OnPassphraseAccepted() OVERRIDE;
   virtual void OnBootstrapTokenUpdated(
       const std::string& bootstrap_token,
       BootstrapTokenType type) OVERRIDE;
   virtual void OnEncryptedTypesChanged(
       ModelTypeSet encrypted_types,
       bool encrypt_everything) OVERRIDE;
   virtual void OnEncryptionComplete() OVERRIDE;
   virtual void OnCryptographerStateChanged(
       Cryptographer* cryptographer) OVERRIDE;
-  virtual void OnPassphraseStateChanged(PassphraseState state) OVERRIDE;
+  virtual void OnPassphraseTypeChanged(PassphraseType type) OVERRIDE;
 
   // Return the currently active (validated) username for use with syncable
   // types.
   const std::string& username_for_share() const;
 
   static int GetDefaultNudgeDelay();
   static int GetPreferencesNudgeDelay();
 
   // SyncEngineEventListener implementation.
   virtual void OnSyncEngineEvent(const SyncEngineEvent& event) OVERRIDE;
@@ skipping 240 matching lines @@
   // changing passphrases, and in general handles sync-specific interactions
   // with the cryptographer.
   scoped_ptr<SyncEncryptionHandlerImpl> sync_encryption_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncManagerImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_SYNC_MANAGER_H_