[iOS] Refactoring web CRWSessionController user agent code.

ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm

Index: ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm
diff --git a/ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm b/ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm
index 2dfd71b2f5d6e6e2ccb759b452cc5248f66e7d3b..d02e65fd018170a64cb9f713a9b05ccf7c2f1d32 100644
--- a/ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm
+++ b/ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm
@@ -37,10 +37,9 @@ void TearDown() override {
   void AddItem(const std::string& url_spec, ui::PageTransition transition) {
     CRWSessionController* session_controller =
         web_state_->GetNavigationManagerImpl().GetSessionController();
-    [session_controller addPendingItem:GURL(url_spec)
-                              referrer:web::Referrer()
-                            transition:transition
-                     rendererInitiated:NO];
+    web_state_->GetNavigationManagerImpl().AddPendingItem(
+        GURL(url_spec), web::Referrer(), transition,
+        web::NavigationInitiationType::USER_INITIATED);
     [session_controller commitPendingItem];
   }