Remove unused ivar in WebViewAutofillClientIOS

Change-Id: Iad60ec64d0633faac2083f5cdf9dfa67fc52ff0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143862
Auto-Submit: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758455}

ios/web_view/internal/autofill/web_view_autofill_client_ios.h

@@ -17,7 +17,6 @@
 #include "components/autofill/core/browser/payments/legal_message_line.h"
 #include "components/autofill/core/browser/payments/strike_database.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
-#include "components/autofill/core/browser/webdata/autofill_webdata_service.h"
 #include "components/prefs/pref_service.h"
 #include "components/sync/driver/sync_service.h"
 #import "ios/web_view/internal/autofill/cwv_autofill_client_ios_bridge.h"
@@ -136,7 +135,6 @@ class WebViewAutofillClientIOS : public AutofillClient {
   std::unique_ptr<payments::PaymentsClient> payments_client_;
   std::unique_ptr<FormDataImporter> form_data_importer_;
   StrikeDatabase* strike_database_;
-  scoped_refptr<AutofillWebDataService> autofill_web_data_service_;
   syncer::SyncService* sync_service_ = nullptr;
   std::unique_ptr<LogManager> log_manager_;