[Payment Request] Moves PaymentRequest into the payments namespace

ios/chrome/browser/ui/payments/payment_request_view_controller_unittest.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.
 
 #import "ios/chrome/browser/ui/payments/payment_request_view_controller.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
@@ skipping 128 matching lines @@
 
 class PaymentRequestViewControllerTest : public CollectionViewControllerTest {
  protected:
   PaymentRequestViewControllerTest()
       : autofill_profile_(autofill::test::GetFullProfile()),
         credit_card_(autofill::test::GetCreditCard()) {
     // Add testing profile and credit card to autofill::TestPersonalDataManager.
     personal_data_manager_.AddTestingProfile(&autofill_profile_);
     personal_data_manager_.AddTestingCreditCard(&credit_card_);
 
-    payment_request_ = base::MakeUnique<TestPaymentRequest>(
+    payment_request_ = base::MakeUnique<payments::TestPaymentRequest>(
         payment_request_test_util::CreateTestWebPaymentRequest(),
         &personal_data_manager_);
 
     mediator_ = [[TestPaymentRequestMediator alloc] init];
   }
 
   CollectionViewController* InstantiateController() override {
     PaymentRequestViewController* viewController =
         [[PaymentRequestViewController alloc] init];
     [viewController setDataSource:mediator_];
     return viewController;
   }
 
   PaymentRequestViewController* GetPaymentRequestViewController() {
     return base::mac::ObjCCastStrict<PaymentRequestViewController>(
         controller());
   }
 
   base::test::ScopedTaskEnvironment scoped_task_evironment_;
 
   autofill::AutofillProfile autofill_profile_;
   autofill::CreditCard credit_card_;
   autofill::TestPersonalDataManager personal_data_manager_;
-  std::unique_ptr<TestPaymentRequest> payment_request_;
+  std::unique_ptr<payments::TestPaymentRequest> payment_request_;
   TestPaymentRequestMediator* mediator_;
 };
 
 // Tests that the correct items are displayed after loading the model.
 TEST_F(PaymentRequestViewControllerTest, TestModel) {
   CreateController();
   CheckController();
   CheckTitleWithId(IDS_PAYMENTS_TITLE);
 
   [GetPaymentRequestViewController() loadModel];
@@ skipping 158 matching lines @@
   ASSERT_EQ(2U, static_cast<unsigned int>(NumberOfItemsInSection(0)));
 
   // The first item should be of type PageInfoItem.
   id item = GetCollectionViewItem(0, 0);
   EXPECT_TRUE([item isMemberOfClass:[PageInfoItem class]]);
 
   // The second item should be of type StatusItem.
   item = GetCollectionViewItem(0, 1);
   EXPECT_TRUE([item isMemberOfClass:[StatusItem class]]);
 }