Updated ownership of NavigationItems within CRWSessionController.

ios/web/navigation/navigation_item_impl_list.mm

Index: ios/web/navigation/navigation_item_impl_list.mm
diff --git a/ios/web/navigation/navigation_item_impl_list.mm b/ios/web/navigation/navigation_item_impl_list.mm
index 22d58130ca3450eaa1c54e8980ecb1f407251cf1..03d4c8728e48a566f45cf31cfdeebcc32aa09a51 100644
--- a/ios/web/navigation/navigation_item_impl_list.mm
+++ b/ios/web/navigation/navigation_item_impl_list.mm
@@ -19,4 +19,13 @@ ScopedNavigationItemImplList CreateScopedNavigationItemImplList(
   return list;
 }
 
+NavigationItemList CreateNavigationItemList(
+    ScopedNavigationItemImplList& scoped_item_list) {
+  NavigationItemList list(scoped_item_list.size());
+  for (size_t index = 0; index < scoped_item_list.size(); ++index) {
+    list[index] = scoped_item_list[index].get();
+  }
+  return list;
+}
+
 }  // namespace web