[Sync] Implement keystore migration support.

sync/internal_api/js_sync_encryption_handler_observer.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_JS_SYNC_ENCRYPTION_HANDLER_OBSERVER_H_
 #define SYNC_INTERNAL_API_JS_SYNC_ENCRYPTION_HANDLER_OBSERVER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 26 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;
 
  private:
   void HandleJsEvent(const tracked_objects::Location& from_here,
                     const std::string& name, const JsEventDetails& details);
 
   WeakHandle<JsEventHandler> event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(JsSyncEncryptionHandlerObserver);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_JS_SYNC_ENCRYPTION_HANDLER_OBSERVER_H_