Update AutofillClientIOS for Autofill changes.

ios/chrome/browser/ui/autofill/autofill_client_ios.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/ui/autofill/autofill_client_ios.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 157 matching lines @@
   // the form_origin. See crbug.com/505388.
   return form_origin.SchemeIsCryptographic();
 }
 
 void AutofillClientIOS::OnFirstUserGestureObserved() {
   // TODO(gcasto): [Merge 306796] http://crbug.com/439425 Verify if this method
   // needs a real implementation or not.
   NOTIMPLEMENTED();
 }
 
+bool AutofillClientIOS::ShouldShowSigninPromo() {
+  return false;
+}
+
+void AutofillClientIOS::StartSigninFlow() {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace autofill