Remove deprecated version of PaymentResponse::ToDictionaryValue.

ios/web/public/payments/payment_request.h

 // Copyright 2016 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.
 
 #ifndef IOS_WEB_PUBLIC_PAYMENTS_PAYMENT_REQUEST_H_
 #define IOS_WEB_PUBLIC_PAYMENTS_PAYMENT_REQUEST_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 297 matching lines @@
   PaymentResponse();
   PaymentResponse(const PaymentResponse& other);
   ~PaymentResponse();
 
   bool operator==(const PaymentResponse& other) const;
   bool operator!=(const PaymentResponse& other) const;
 
   // Populates |value| with the properties of this PaymentResponse.
   std::unique_ptr<base::DictionaryValue> ToDictionaryValue() const;
 
-  // TODO(jdonnelly): Remove this after removing downstream use.
-  void ToDictionaryValue(base::DictionaryValue* value) const;
-
   // The payment method identifier for the payment method that the user selected
   // to fulfil the transaction.
   base::string16 method_name;
 
   // A credit card response object used by the merchant to process the
   // transaction and determine successful fund transfer.
   BasicCardResponse details;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_PAYMENTS_PAYMENT_REQUEST_H_