Use a const reference in IntentPickerResponse

chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc

Index: chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
diff --git a/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
index 35157fd48b9e967d486ac1c389132da9e8239b80..50b3fd7d3c60f2558908bb2bb337f9d1720dfbf2 100644
--- a/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
+++ b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
@@ -70,7 +70,7 @@ void OnIntentPickerClosed(int render_process_host_id,
                           int routing_id,
                           const GURL& url,
                           mojo::Array<mojom::IntentHandlerInfoPtr> handlers,
-                          std::string selected_app_package,
+                          const std::string& selected_app_package,
                           ArcNavigationThrottle::CloseReason close_reason) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);