Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/engine/syncer_command.cc

 // Copyright (c) 2011 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 "chrome/browser/sync/engine/syncer_command.h"
 
 #include "chrome/browser/sync/engine/net/server_connection_manager.h"
 #include "chrome/browser/sync/sessions/sync_session.h"
 #include "chrome/browser/sync/syncable/directory_manager.h"
 
 namespace browser_sync {
 using sessions::SyncSession;
 
 SyncerCommand::SyncerCommand() {}
 SyncerCommand::~SyncerCommand() {}
 
-void SyncerCommand::Execute(SyncSession* session) {
-  ExecuteImpl(session);
+SyncerError SyncerCommand::Execute(SyncSession* session) {
+  SyncerError result = ExecuteImpl(session);
   SendNotifications(session);
+  return result;
 }
 
 void SyncerCommand::SendNotifications(SyncSession* session) {
   syncable::ScopedDirLookup dir(session->context()->directory_manager(),
                                 session->context()->account_name());
   if (!dir.good()) {
     LOG(ERROR) << "Scoped dir lookup failed!";
     return;
   }
 
   if (session->mutable_status_controller()->TestAndClearIsDirty()) {
     SyncEngineEvent event(SyncEngineEvent::STATUS_CHANGED);
     const sessions::SyncSessionSnapshot& snapshot(session->TakeSnapshot());
     event.snapshot = &snapshot;
     session->context()->NotifyListeners(event);
   }
 }
 
 }  // namespace browser_sync