[Sync] Add ability to save/restore Nigori to SyncEncryptionHandlerImpl

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 42de79e4c3fbcbfe4aaba03c6f2ee0af9e633b8e..a982410455b1961cce24435c62843a632402c8d2 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -404,6 +404,10 @@ void SyncManagerImpl::OnPassphraseTypeChanged(
       sync_encryption_handler_->migration_time());
 }
 
+void SyncManagerImpl::OnLocalSetPassphraseEncryption(
+    const SyncEncryptionHandler::NigoriState& nigori_state) {
+}
+
 void SyncManagerImpl::StartSyncingNormally(
     const ModelSafeRoutingInfo& routing_info,
     base::Time last_poll_time) {