[Web Payments] Refactor sheet display to allow updating view content

chrome/browser/ui/views/payments/payment_sheet_view_controller.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_SHEET_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_SHEET_VIEW_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
 // Payment Request dialog.
 class PaymentSheetViewController : public PaymentRequestSheetController,
                                    public PaymentRequestState::Observer {
  public:
   // Does not take ownership of the arguments, which should outlive this object.
   PaymentSheetViewController(PaymentRequestSpec* spec,
                              PaymentRequestState* state,
                              PaymentRequestDialogView* dialog);
   ~PaymentSheetViewController() override;
 
-  // PaymentRequestSheetController:
-  std::unique_ptr<views::View> CreateView() override;
-
   // PaymentRequestState::Observer:
   void OnSelectedInformationChanged() override;
 
  private:
   // PaymentRequestSheetController:
   std::unique_ptr<views::Button> CreatePrimaryButton() override;
+  bool ShouldShowHeaderBackArrow() override;
+  base::string16 GetSheetTitle() override;
+  void FillContentView(views::View* content_view) override;
   std::unique_ptr<views::View> CreateExtraFooterView() override;
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   void UpdatePayButtonState(bool enabled);
-  void UpdateContentView();
 
   std::unique_ptr<views::View> CreateShippingSectionContent();
   std::unique_ptr<views::Button> CreateShippingRow();
   std::unique_ptr<views::Button> CreatePaymentSheetSummaryRow();
   std::unique_ptr<views::Button> CreatePaymentMethodRow();
   std::unique_ptr<views::View> CreateContactInfoSectionContent();
   std::unique_ptr<views::Button> CreateContactInfoRow();
   std::unique_ptr<views::Button> CreateShippingOptionRow();
 
-  std::unique_ptr<views::View> container_view_;
   views::Button* pay_button_;
 
   const int widest_name_column_view_width_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentSheetViewController);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_SHEET_VIEW_CONTROLLER_H_