[Payments] base::string16 -> std::string in PaymentMethodData

components/payments/core/payment_method_data.h

 // Copyright 2017 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 COMPONENTS_PAYMENTS_CORE_PAYMENT_METHOD_DATA_H_
 #define COMPONENTS_PAYMENTS_CORE_PAYMENT_METHOD_DATA_H_
 
 #include <memory>
+#include <string>
 #include <vector>
 
-#include "base/strings/string16.h"
-
 namespace base {
 class DictionaryValue;
 }
 
 namespace payments {
 
 // A set of supported payment methods and any associated payment method specific
 // data for those methods.
 class PaymentMethodData {
  public:
   PaymentMethodData();
   PaymentMethodData(const PaymentMethodData& other);
   ~PaymentMethodData();
 
   bool operator==(const PaymentMethodData& other) const;
   bool operator!=(const PaymentMethodData& other) const;
 
   // Populates the properties of this PaymentMethodData from |value|. Returns
   // true if the required values are present.
   bool FromDictionaryValue(const base::DictionaryValue& value);
 
   // Payment method identifiers for payment methods that the merchant web site
   // accepts.
-  std::vector<base::string16> supported_methods;
+  std::vector<std::string> supported_methods;
 
   // A JSON-serialized object that provides optional information that might be
   // needed by the supported payment methods.
-  base::string16 data;
+  std::string data;
 
   // When the methods include "basic-card", a list of networks and types that
   // are supported.
-  std::vector<base::string16> supported_networks;
-  std::vector<base::string16> supported_types;
+  std::vector<std::string> supported_networks;
+  std::vector<std::string> supported_types;
 };
 
 }  // namespace payments
 
 #endif  // COMPONENTS_PAYMENTS_CORE_PAYMENT_METHOD_DATA_H_