sync: Move migration signal out of snapshot

sync/test/engine/fake_sync_scheduler.cc

 // 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.
 
 #include "sync/test/engine/fake_sync_scheduler.h"
 
 namespace syncer {
 
 FakeSyncScheduler::FakeSyncScheduler() {}
 
@@ skipping 71 matching lines @@
 void FakeSyncScheduler::OnReceivedClientInvalidationHintBufferSize(int size) {
 }
 
 void FakeSyncScheduler::OnSyncProtocolError(const SyncProtocolError& error) {
 }
 
 void FakeSyncScheduler::OnReceivedGuRetryDelay(
     const base::TimeDelta& delay) {
 }
 
+void FakeSyncScheduler::OnReceivedMigrationRequest(ModelTypeSet types) {
+}
+
 }  // namespace syncer