[ios] Check InfobarIOS InfobarType instead of InfobarUIDelegate

InfobarUIDelegate is not being used with the Infobar migration to
Overlays. Thus, looking up an InfobarIOS's Infobar type should
use its new infobar_type() property.

Bug: 1121143
Change-Id: I0d340939d038d366eaf0ad631503cae9188dd1bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373665
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801261}

ios/chrome/browser/passwords/password_controller.mm

@@ -379,7 +379,7 @@ constexpr int kNotifyAutoSigninDuration = 3;  // seconds
   for (size_t i = 0; i < count; i++) {
     InfoBarIOS* infobar =
         static_cast<InfoBarIOS*>(infoBarManager->infobar_at(i));
-    if (infobar->InfobarUIDelegate().infobarType == infobarType &&
+    if (infobar->infobar_type() == infobarType &&
         infobar->skip_banner() == manual)
       return infobar;
   }