Change SigninClient::CreateGaiaAuthFetcher return type to unique_ptr

google_apis/gaia/ubertoken_fetcher.h

Index: google_apis/gaia/ubertoken_fetcher.h
diff --git a/google_apis/gaia/ubertoken_fetcher.h b/google_apis/gaia/ubertoken_fetcher.h
index 6fef55b6c932f56dcb220f4d4cad1b99770c49c1..b5968af5d6d91ab093727ad92cef1a0b144b494d 100644
--- a/google_apis/gaia/ubertoken_fetcher.h
+++ b/google_apis/gaia/ubertoken_fetcher.h
@@ -28,10 +28,10 @@ namespace net {
 class URLRequestContextGetter;
 }
 
-typedef base::Callback<GaiaAuthFetcher*(GaiaAuthConsumer*,
-                                        const std::string&,
-                                        net::URLRequestContextGetter*)>
-    GaiaAuthFetcherFactory;
+using GaiaAuthFetcherFactory = base::Callback<std::unique_ptr<GaiaAuthFetcher>(
+    GaiaAuthConsumer*,
+    const std::string&,
+    net::URLRequestContextGetter*)>;
 
 // Callback for the |UbertokenFetcher| class.
 class UbertokenConsumer {