[Payment Request] Moves PaymentRequest into the payments namespace

ios/chrome/browser/ui/payments/shipping_option_selection_mediator.mm

Index: ios/chrome/browser/ui/payments/shipping_option_selection_mediator.mm
diff --git a/ios/chrome/browser/ui/payments/shipping_option_selection_mediator.mm b/ios/chrome/browser/ui/payments/shipping_option_selection_mediator.mm
index deda3a0cccd38773b0de90147381f11e183286bd..e3bcaa20a11c2a3625b8e9837b4b172bdf9ceed6 100644
--- a/ios/chrome/browser/ui/payments/shipping_option_selection_mediator.mm
+++ b/ios/chrome/browser/ui/payments/shipping_option_selection_mediator.mm
@@ -24,7 +24,7 @@
 // The PaymentRequest object owning an instance of web::PaymentRequest as
 // provided by the page invoking the Payment Request API. This is a weak
 // pointer and should outlive this class.
-@property(nonatomic, assign) PaymentRequest* paymentRequest;
+@property(nonatomic, assign) payments::PaymentRequest* paymentRequest;
 
 // The selectable items to display in the collection.
 @property(nonatomic, strong) NSMutableArray<PaymentsTextItem*>* items;
@@ -42,7 +42,8 @@
 @synthesize paymentRequest = _paymentRequest;
 @synthesize items = _items;
 
-- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
+- (instancetype)initWithPaymentRequest:
+    (payments::PaymentRequest*)paymentRequest {
   self = [super init];
   if (self) {
     _paymentRequest = paymentRequest;