[Payment Request] Moves PaymentRequest into the payments namespace

ios/chrome/browser/ui/payments/billing_address_selection_mediator.h

Index: ios/chrome/browser/ui/payments/billing_address_selection_mediator.h
diff --git a/ios/chrome/browser/ui/payments/billing_address_selection_mediator.h b/ios/chrome/browser/ui/payments/billing_address_selection_mediator.h
index 4c975ee6efe22b569739ced6b06b1503da6e54a1..c696ac3b7a3dd0624f25889fd3edc85b807c66af 100644
--- a/ios/chrome/browser/ui/payments/billing_address_selection_mediator.h
+++ b/ios/chrome/browser/ui/payments/billing_address_selection_mediator.h
@@ -7,12 +7,14 @@
 
 #import "ios/chrome/browser/ui/payments/payment_request_selector_view_controller_data_source.h"
 
-class PaymentRequest;
-
 namespace autofill {
 class AutofillProfile;
 }  // namespace autofill
 
+namespace payments {
+class PaymentRequest;
+}  // namespace payments
+
 // Serves as data source for PaymentRequestSelectorViewController.
 @interface BillingAddressSelectionMediator
     : NSObject<PaymentRequestSelectorViewControllerDataSource>
@@ -30,7 +32,7 @@ class AutofillProfile;
 // of web::PaymentRequest as provided by the page invoking the Payment Request
 // API as well as the selected billing profile. This object will not take
 // ownership of |paymentRequest| or |selectedBillingProfile|.
-- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest
+- (instancetype)initWithPaymentRequest:(payments::PaymentRequest*)paymentRequest
                 selectedBillingProfile:
                     (autofill::AutofillProfile*)selectedBillingProfile
     NS_DESIGNATED_INITIALIZER;