Add OVERRIDE to chrome/browser/sync/.

chrome/browser/sync/engine/download_updates_command.h

Index: chrome/browser/sync/engine/download_updates_command.h
diff --git a/chrome/browser/sync/engine/download_updates_command.h b/chrome/browser/sync/engine/download_updates_command.h
index 330cd37139a1639437ed39eb10ec665d2029086c..f40a4535a80e19e4cf04e514db32fcbb7f70cafe 100644
--- a/chrome/browser/sync/engine/download_updates_command.h
+++ b/chrome/browser/sync/engine/download_updates_command.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "chrome/browser/sync/engine/model_safe_worker.h"
 #include "chrome/browser/sync/engine/syncer_command.h"
@@ -43,7 +44,7 @@ class DownloadUpdatesCommand : public SyncerCommand {
   virtual ~DownloadUpdatesCommand();
 
   // SyncerCommand implementation.
-  virtual void ExecuteImpl(sessions::SyncSession* session);
+  virtual void ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
 
   void SetRequestedTypes(const syncable::ModelTypeBitSet& target_datatypes,
                          sync_pb::EntitySpecifics* filter_protobuf);