Updated ownership of NavigationItems within CRWSessionController.

ios/web/navigation/crw_session_controller_unittest.mm

Index: ios/web/navigation/crw_session_controller_unittest.mm
diff --git a/ios/web/navigation/crw_session_controller_unittest.mm b/ios/web/navigation/crw_session_controller_unittest.mm
index 40b2c18c8896dd6b4ff8b8883cc8c9aef5561da5..cc4f3c8bd0fc32e95e8f0ab0ce2c962f2401ed6c 100644
--- a/ios/web/navigation/crw_session_controller_unittest.mm
+++ b/ios/web/navigation/crw_session_controller_unittest.mm
@@ -808,18 +808,12 @@ void SetUp() override {
       [[CRWSessionController alloc] initWithNavigationItems:std::move(items)
                                                currentIndex:0
                                                browserState:&browser_state_]);
-  web::NavigationItemImpl* item0 =
-      static_cast<web::NavigationItemImpl*>([controller items][0]);
-  web::NavigationItemImpl* item1 =
-      static_cast<web::NavigationItemImpl*>([controller items][1]);
-  web::NavigationItemImpl* item2 =
-      static_cast<web::NavigationItemImpl*>([controller items][2]);
-  web::NavigationItemImpl* item3 =
-      static_cast<web::NavigationItemImpl*>([controller items][3]);
-  web::NavigationItemImpl* item4 =
-      static_cast<web::NavigationItemImpl*>([controller items][4]);
-  web::NavigationItemImpl* item5 =
-      static_cast<web::NavigationItemImpl*>([controller items][5]);
+  web::NavigationItemImpl* item0 = [controller items][0].get();
+  web::NavigationItemImpl* item1 = [controller items][1].get();
+  web::NavigationItemImpl* item2 = [controller items][2].get();
+  web::NavigationItemImpl* item3 = [controller items][3].get();
+  web::NavigationItemImpl* item4 = [controller items][4].get();
+  web::NavigationItemImpl* item5 = [controller items][5].get();
   item1->SetIsCreatedFromPushState(true);
   item4->SetIsCreatedFromHashChange(true);
   item5->SetIsCreatedFromPushState(true);