[iOS][Passwords] Observe password changes

Bug: 1130571
Change-Id: Id3f2ed7e38c1e6863755730c7e02a3380221e336
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435094Reviewed-by: Sean Harrison <harrisonsean@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811632}

ios/chrome/browser/ui/settings/password/passwords_mediator.mm

@@ -90,15 +90,15 @@ constexpr base::TimeDelta kJustCheckedTimeThresholdInMinutes =
     _syncService = syncService;
     _savedPasswordsConsumer =
         std::make_unique<ios::SavePasswordsConsumer>(self);
+    _passwordStoreObserver =
+        std::make_unique<PasswordStoreObserverBridge>(self);
+    _passwordStore->AddObserver(_passwordStoreObserver.get());
 
     if (base::FeatureList::IsEnabled(
             password_manager::features::kPasswordCheck)) {
       _passwordCheckManager = passwordCheckManager;
       _passwordCheckObserver = std::make_unique<PasswordCheckObserverBridge>(
           self, _passwordCheckManager.get());
-      _passwordStoreObserver =
-          std::make_unique<PasswordStoreObserverBridge>(self);
-      _passwordStore->AddObserver(_passwordStoreObserver.get());
     }
   }
   return self;