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

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

Index: chrome/browser/ui/views/payments/payment_method_view_controller.cc
diff --git a/chrome/browser/ui/views/payments/payment_method_view_controller.cc b/chrome/browser/ui/views/payments/payment_method_view_controller.cc
index 2660e0483a0b3eace801d06bb479a7fbe6ee620e..a16a379fc02828a0c5ac05712105b8798f35ce7f 100644
--- a/chrome/browser/ui/views/payments/payment_method_view_controller.cc
+++ b/chrome/browser/ui/views/payments/payment_method_view_controller.cc
@@ -129,18 +129,17 @@ PaymentMethodViewController::PaymentMethodViewController(
 
 PaymentMethodViewController::~PaymentMethodViewController() {}
 
-std::unique_ptr<views::View> PaymentMethodViewController::CreateView() {
+base::string16 PaymentMethodViewController::GetSheetTitle() {
+  return l10n_util::GetStringUTF16(
+      IDS_PAYMENT_REQUEST_PAYMENT_METHOD_SECTION_NAME);
+}
+
+void PaymentMethodViewController::FillContentView(views::View* content_view) {
   std::unique_ptr<views::View> list_view =
       payment_method_list_.CreateListView();
   list_view->set_id(
       static_cast<int>(DialogViewID::PAYMENT_METHOD_SHEET_LIST_VIEW));
-  return CreatePaymentView(
-      CreateSheetHeaderView(
-          true,
-          l10n_util::GetStringUTF16(
-              IDS_PAYMENT_REQUEST_PAYMENT_METHOD_SECTION_NAME),
-          this),
-      std::move(list_view));
+  content_view->AddChildView(list_view.release());
 }
 
 std::unique_ptr<views::View>