replace OVERRIDE and FINAL with override and final in sync/

sync/internal_api/public/attachments/fake_attachment_downloader.h

 // Copyright 2014 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.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_
 
 #include "base/threading/non_thread_safe.h"
 #include "sync/internal_api/public/attachments/attachment_downloader.h"
 
 namespace syncer {
 
 // FakeAttachmentDownloader is for tests. For every request it posts a success
 // callback with empty attachment.
 class SYNC_EXPORT FakeAttachmentDownloader : public AttachmentDownloader,
                                              public base::NonThreadSafe {
  public:
   FakeAttachmentDownloader();
   virtual ~FakeAttachmentDownloader();
 
   // AttachmentDownloader implementation.
   virtual void DownloadAttachment(const AttachmentId& attachment_id,
-                                  const DownloadCallback& callback) OVERRIDE;
+                                  const DownloadCallback& callback) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FakeAttachmentDownloader);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_