[Payment Request] Moves PaymentRequest into the payments namespace

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

Index: ios/chrome/browser/ui/payments/payment_request_coordinator.h
diff --git a/ios/chrome/browser/ui/payments/payment_request_coordinator.h b/ios/chrome/browser/ui/payments/payment_request_coordinator.h
index 90779d4bb39d03707cfa3730a77200ce91d5ec05..b5d860a34071391ceb59a33417845d910eff3fa6 100644
--- a/ios/chrome/browser/ui/payments/payment_request_coordinator.h
+++ b/ios/chrome/browser/ui/payments/payment_request_coordinator.h
@@ -23,8 +23,6 @@
 #import "ios/chrome/browser/ui/payments/shipping_address_selection_coordinator.h"
 #import "ios/chrome/browser/ui/payments/shipping_option_selection_coordinator.h"
 
-class PaymentRequest;
-
 namespace autofill {
 class AutofillManager;
 }  // namespace autofill
@@ -33,6 +31,10 @@ namespace ios {
 class ChromeBrowserState;
 }  // namespace ios
 
+namespace payments {
+class PaymentRequest;
+}  // namespace payments
+
 namespace web {
 class PaymentDetails;
 class PaymentShippingOption;
@@ -89,7 +91,7 @@ class PaymentShippingOption;
 // The PaymentRequest object having a copy of web::PaymentRequest as provided by
 // the page invoking the Payment Request API. This pointer is not owned by this
 // class and should outlive it.
-@property(nonatomic, assign) PaymentRequest* paymentRequest;
+@property(nonatomic, assign) payments::PaymentRequest* paymentRequest;
 
 // An instance of autofill::AutofillManager used for credit card unmasking. This
 // reference is not owned by this class.