Revert of Cleaned up old navigation code that did not use pending navigation item.

ios/web/interstitials/web_interstitial_impl.mm

Index: ios/web/interstitials/web_interstitial_impl.mm
diff --git a/ios/web/interstitials/web_interstitial_impl.mm b/ios/web/interstitials/web_interstitial_impl.mm
index 1a9febb41a5510d446a02e7e28c507fae7d87804..30698e685af337157ee9d24329ae96206422b708 100644
--- a/ios/web/interstitials/web_interstitial_impl.mm
+++ b/ios/web/interstitials/web_interstitial_impl.mm
@@ -84,11 +84,18 @@
 
   // Clear the pending entry, since that's the page that's not being
   // proceeded to.
-  GetWebStateImpl()->GetNavigationManager()->DiscardNonCommittedItems();
+  NavigationManager* nav_manager = GetWebStateImpl()->GetNavigationManager();
+  nav_manager->DiscardNonCommittedItems();
 
   Hide();
 
   GetDelegate()->OnDontProceed();
+
+  NSUserDefaults* user_defaults = [NSUserDefaults standardUserDefaults];
+  if (![user_defaults boolForKey:@"PendingIndexNavigationDisabled"]) {
+    // Reload last committed entry.
+    nav_manager->Reload(ReloadType::NORMAL, true /* check_for_repost */);
+  }
 
   delete this;
 }