[Payment Request] Moves PaymentRequest into the payments namespace

ios/chrome/browser/ui/payments/credit_card_edit_mediator.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 IOS_CHROME_BROWSER_UI_PAYMENTS_CREDIT_CARD_EDIT_MEDIATOR_H_
 #define IOS_CHROME_BROWSER_UI_PAYMENTS_CREDIT_CARD_EDIT_MEDIATOR_H_
 
 #import "ios/chrome/browser/ui/payments/payment_request_edit_view_controller_data_source.h"
 
-class PaymentRequest;
 @protocol PaymentRequestEditConsumer;
 
 namespace autofill {
 class AutofillProfile;
 class CreditCard;
 }  // namespace autofill
 
+namespace payments {
+class PaymentRequest;
+}  // namespace payments
+
 // Serves as data source for CreditCardEditViewController.
 @interface CreditCardEditViewControllerMediator
     : NSObject<PaymentRequestEditViewControllerDataSource>
 
 // The consumer for this object. This can change during the lifetime of this
 // object and may be nil.
 @property(nonatomic, weak) id<PaymentRequestEditConsumer> consumer;
 
 // The billing profile, if any.
 @property(nonatomic, assign) autofill::AutofillProfile* billingProfile;
 
 // Initializes this object with an instance of PaymentRequest which has a copy
 // of web::PaymentRequest as provided by the page invoking the Payment Request
 // API as well as |creditCard| which is the credit card to be edited, if any.
 // This object will not take ownership of |paymentRequest| or |creditCard|.
-- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest
+- (instancetype)initWithPaymentRequest:(payments::PaymentRequest*)paymentRequest
                             creditCard:(autofill::CreditCard*)creditCard
     NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_PAYMENTS_CREDIT_CARD_EDIT_MEDIATOR_H_