[Sync] Implement keystore migration support.

sync/test/fake_sync_encryption_handler.h

Index: sync/test/fake_sync_encryption_handler.h
diff --git a/sync/test/fake_sync_encryption_handler.h b/sync/test/fake_sync_encryption_handler.h
index 082f607953c487f51ec4c4178fae61d28b47c2c0..ef32744a36b96d397ad4fa24fbd29ee28db6a45a 100644
--- a/sync/test/fake_sync_encryption_handler.h
+++ b/sync/test/fake_sync_encryption_handler.h
@@ -37,7 +37,7 @@ class FakeSyncEncryptionHandler : public SyncEncryptionHandler,
   virtual void SetDecryptionPassphrase(const std::string& passphrase) OVERRIDE;
   virtual void EnableEncryptEverything() OVERRIDE;
   virtual bool EncryptEverythingEnabled() const OVERRIDE;
-  virtual PassphraseState GetPassphraseState() const OVERRIDE;
+  virtual PassphraseType GetPassphraseType() const OVERRIDE;
 
   // NigoriHandler implemenation.
   virtual void ApplyNigoriUpdate(
@@ -60,7 +60,7 @@ class FakeSyncEncryptionHandler : public SyncEncryptionHandler,
   ObserverList<SyncEncryptionHandler::Observer> observers_;
   ModelTypeSet encrypted_types_;
   bool encrypt_everything_;
-  PassphraseState passphrase_state_;
+  PassphraseType passphrase_type_;
 
   FakeEncryptor encryptor_;
   Cryptographer cryptographer_;