[Autofill] Implement Autofill Assistant infobar for iOS

components/autofill/core/browser/autofill_experiments.cc

Index: components/autofill/core/browser/autofill_experiments.cc
diff --git a/components/autofill/core/browser/autofill_experiments.cc b/components/autofill/core/browser/autofill_experiments.cc
index 03731e9848a58912843f770f41cd1ccac9103d68..185c0216b6726e3dde2d27cb3f783f4233571761 100644
--- a/components/autofill/core/browser/autofill_experiments.cc
+++ b/components/autofill/core/browser/autofill_experiments.cc
@@ -46,6 +46,9 @@ bool IsAutofillCreditCardSigninPromoEnabled() {
 }
 
 bool IsAutofillCreditCardAssistEnabled() {
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+  return false;
+#endif
   return base::FeatureList::IsEnabled(kAutofillCreditCardAssist);
 }