payments: migrate GetDialogButtonLabel -> set_button_label

While the Ok/Cancel messages appear to be dynamically computed, in fact this
dialog never calls DialogModelChanged, so the initial messages are always the
ones used. As such, this change will cause no behavior difference.

Bug: 1011446
Change-Id: Ib23484c83eaa8c64b8e5062d922b0365b4e65d66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854684Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706517}

chrome/browser/ui/views/autofill/payments/local_card_migration_dialog_view.cc

@@ -352,6 +352,9 @@ LocalCardMigrationDialogView::LocalCardMigrationDialogView(
     LocalCardMigrationDialogController* controller,
     content::WebContents* web_contents)
     : controller_(controller), web_contents_(web_contents) {
+  DialogDelegate::set_button_label(ui::DIALOG_BUTTON_OK, GetOkButtonLabel());
+  DialogDelegate::set_button_label(ui::DIALOG_BUTTON_CANCEL,
+                                   GetCancelButtonLabel());
   set_close_on_deactivate(false);
   set_margins(gfx::Insets());
 }
@@ -395,12 +398,6 @@ int LocalCardMigrationDialogView::GetDialogButtons() const {
   return ui::DIALOG_BUTTON_OK | ui::DIALOG_BUTTON_CANCEL;
 }
 
-base::string16 LocalCardMigrationDialogView::GetDialogButtonLabel(
-    ui::DialogButton button) const {
-  return button == ui::DIALOG_BUTTON_OK ? GetOkButtonLabel()
-                                        : GetCancelButtonLabel();
-}
-
 // TODO(crbug.com/867194): Update this method when adding feedback.
 bool LocalCardMigrationDialogView::IsDialogButtonEnabled(
     ui::DialogButton button) const {

chrome/browser/ui/views/autofill/payments/local_card_migration_dialog_view.h

@@ -38,7 +38,6 @@ class LocalCardMigrationDialogView : public LocalCardMigrationDialog,
   ui::ModalType GetModalType() const override;
   bool ShouldShowCloseButton() const override;
   int GetDialogButtons() const override;
-  base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   bool IsDialogButtonEnabled(ui::DialogButton button) const override;
   bool Accept() override;
   bool Cancel() override;