Remove unnecessary and spammy NOTIMPLEMENTED() in AutofillClientIOS.

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 38 matching lines @@
 
 PersonalDataManager* AutofillClientIOS::GetPersonalDataManager() {
   return autofill::PersonalDataManagerFactory::GetForBrowserState(
       browser_state_->GetOriginalChromeBrowserState());
 }
 
 PrefService* AutofillClientIOS::GetPrefs() {
   return browser_state_->GetPrefs();
 }
 
-// TODO(jdonnelly): Implement this when adding credit card upload.
+// TODO(crbug.com/535784): Implement this when adding credit card upload.
 syncer::SyncService* AutofillClientIOS::GetSyncService() {
-  NOTIMPLEMENTED();
   return nullptr;
 }
 
 IdentityProvider* AutofillClientIOS::GetIdentityProvider() {
   return identity_provider_.get();
 }
 
 rappor::RapporService* AutofillClientIOS::GetRapporService() {
   return GetApplicationContext()->GetRapporService();
 }
@@ skipping 120 matching lines @@
 
 bool AutofillClientIOS::ShouldShowSigninPromo() {
   return false;
 }
 
 void AutofillClientIOS::StartSigninFlow() {
   NOTIMPLEMENTED();
 }
 
 }  // namespace autofill