[iOS] Removing pre unified consent code in UnifiedConsentServiceFactory

Unified consent feature flag is always on.

Bug: 951313
Change-Id: I2c80c83039c628a88781f80979c7e20dd9a1412f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798602
Auto-Submit: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695651}

ios/chrome/browser/unified_consent/unified_consent_service_factory.cc

@@ -10,7 +10,6 @@
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "components/sync/driver/sync_service.h"
 #include "components/sync_preferences/pref_service_syncable.h"
-#include "components/unified_consent/feature.h"
 #include "components/unified_consent/unified_consent_metrics.h"
 #include "components/unified_consent/unified_consent_service.h"
 #include "ios/chrome/browser/application_context.h"
@@ -67,12 +66,6 @@ UnifiedConsentServiceFactory::BuildServiceInstanceFor(
   // Record settings for pre- and post-UnifiedConsent users.
   unified_consent::metrics::RecordSettingsHistogram(user_pref_service);
 
-  if (!unified_consent::IsUnifiedConsentFeatureEnabled()) {
-    unified_consent::UnifiedConsentService::RollbackIfNeeded(user_pref_service,
-                                                             sync_service);
-    return nullptr;
-  }
-
   // List of synced prefs that can be configured during the settings opt-in
   // flow.
   std::vector<std::string> synced_service_pref_names;