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

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

Index: chrome/browser/ui/views/payments/payment_method_view_controller.h
diff --git a/chrome/browser/ui/views/payments/payment_method_view_controller.h b/chrome/browser/ui/views/payments/payment_method_view_controller.h
index d5c14221ccb6b331c04833d4901b0c89a4bb3954..183f0467e11e6d0a199e48974ec30e5345b4dc12 100644
--- a/chrome/browser/ui/views/payments/payment_method_view_controller.h
+++ b/chrome/browser/ui/views/payments/payment_method_view_controller.h
@@ -25,11 +25,10 @@ class PaymentMethodViewController : public PaymentRequestSheetController {
                               PaymentRequestDialogView* dialog);
   ~PaymentMethodViewController() override;
 
-  // PaymentRequestSheetController:
-  std::unique_ptr<views::View> CreateView() override;
-
  private:
   // PaymentRequestSheetController:
+  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;