sync: Move migration signal out of snapshot

sync/engine/all_status.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/engine/all_status.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/port.h"
@@ skipping 104 matching lines @@
 void AllStatus::OnRetryTimeChanged(base::Time retry_time) {
   ScopedStatusLock lock(this);
   status_.retry_time = retry_time;
 }
 
 void AllStatus::OnThrottledTypesChanged(ModelTypeSet throttled_types) {
   ScopedStatusLock lock(this);
   status_.throttled_types = throttled_types;
 }
 
+void AllStatus::OnMigrationRequested(ModelTypeSet) {}
+
 SyncStatus AllStatus::status() const {
   base::AutoLock lock(mutex_);
   return status_;
 }
 
 void AllStatus::SetNotificationsEnabled(bool notifications_enabled) {
   ScopedStatusLock lock(this);
   status_.notifications_enabled = notifications_enabled;
 }
 
@@ skipping 66 matching lines @@
 ScopedStatusLock::ScopedStatusLock(AllStatus* allstatus)
     : allstatus_(allstatus) {
   allstatus->mutex_.Acquire();
 }
 
 ScopedStatusLock::~ScopedStatusLock() {
   allstatus_->mutex_.Release();
 }
 
 }  // namespace syncer