replace OVERRIDE and FINAL with override and final in sync/

sync/internal_api/public/attachments/attachment_downloader_impl.h

Index: sync/internal_api/public/attachments/attachment_downloader_impl.h
diff --git a/sync/internal_api/public/attachments/attachment_downloader_impl.h b/sync/internal_api/public/attachments/attachment_downloader_impl.h
index 8b62ec34dc1604255279e8175057d933bd58e775..c803b48be997d7dcfb6b756a1c2bff6a8ccd52f7 100644
--- a/sync/internal_api/public/attachments/attachment_downloader_impl.h
+++ b/sync/internal_api/public/attachments/attachment_downloader_impl.h
@@ -42,17 +42,17 @@ class AttachmentDownloaderImpl : public AttachmentDownloader,
 
   // AttachmentDownloader implementation.
   virtual void DownloadAttachment(const AttachmentId& attachment_id,
-                                  const DownloadCallback& callback) OVERRIDE;
+                                  const DownloadCallback& callback) override;
 
   // OAuth2TokenService::Consumer implementation.
   virtual void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
                                  const std::string& access_token,
-                                 const base::Time& expiration_time) OVERRIDE;
+                                 const base::Time& expiration_time) override;
   virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
-                                 const GoogleServiceAuthError& error) OVERRIDE;
+                                 const GoogleServiceAuthError& error) override;
 
   // net::URLFetcherDelegate implementation.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
 
  private:
   struct DownloadState;