Add a missing #include <fstream>, required since Flatbuffers no longer includes

jonsimantov · a-maurice · commit c1271b45dd0d · 2019-04-19T16:57:19.000-07:00
it for you.

PiperOrigin-RevId: 243332621
diff --git a/auth/src/desktop/user_desktop.cc b/auth/src/desktop/user_desktop.cc
@@ -13,7 +13,10 @@
 // limitations under the License.
 
 #include "auth/src/desktop/user_desktop.h"
+
+#include <fstream>
 #include <memory>
+
 #include "app/rest/transport_builder.h"
 #include "app/rest/util.h"
 #include "app/src/thread.h"
