[Payment Request] Moves PaymentRequest into the payments namespace

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

 // 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.
 
 #include <vector>
 
 #import "ios/chrome/browser/ui/payments/payment_method_selection_mediator.h"
 
 #include "base/strings/string16.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 20 matching lines @@
 using ::payment_request_util::GetBillingAddressLabelFromAutofillProfile;
 using ::payment_request_util::
     GetPaymentMethodNotificationLabelFromPaymentMethod;
 }  // namespace
 
 @interface PaymentMethodSelectionMediator ()
 
 // 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<PaymentMethodItem*>* items;
 
 @end
 
 @implementation PaymentMethodSelectionMediator
 
 @synthesize state = _state;
 @synthesize selectedItemIndex = _selectedItemIndex;
 @synthesize paymentRequest = _paymentRequest;
 @synthesize items = _items;
 
-- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
+- (instancetype)initWithPaymentRequest:
+    (payments::PaymentRequest*)paymentRequest {
   self = [super init];
   if (self) {
     _paymentRequest = paymentRequest;
     _selectedItemIndex = NSUIntegerMax;
     [self loadItems];
   }
   return self;
 }
 
 #pragma mark - PaymentRequestSelectorViewControllerDataSource
@@ skipping 57 matching lines @@
 
     item.reserveRoomForAccessoryType = YES;
     if (_paymentRequest->selected_payment_method() == paymentMethod)
       _selectedItemIndex = index;
 
     [_items addObject:item];
   }
 }
 
 @end