Remove ConstrainedWindowGtkDelegate

chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc

Index: chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc
diff --git a/chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc b/chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc
index 6b214ae4efb3fedaa1bac1f8df05ca3d2ff33950..55c70a7f4494f2c79ef0867156c74f4f8d94120f 100644
--- a/chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc
+++ b/chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc
@@ -71,7 +71,9 @@ TabModalConfirmDialogGtk::TabModalConfirmDialogGtk(
   g_signal_connect(ok_, "clicked", G_CALLBACK(OnAcceptThunk), this);
   gtk_box_pack_end(GTK_BOX(buttonBox), ok_, FALSE, TRUE, 0);
 
-  window_ = CreateWebContentsModalDialogGtk(web_contents, this);
+  g_signal_connect(dialog_, "destroy", G_CALLBACK(OnDestroyThunk), this);
+
+  window_ = CreateWebContentsModalDialogGtk(web_contents, dialog_, cancel_);
   delegate_->set_close_delegate(this);
 
   WebContentsModalDialogManager* web_contents_modal_dialog_manager =
@@ -79,18 +81,6 @@ TabModalConfirmDialogGtk::TabModalConfirmDialogGtk(
   web_contents_modal_dialog_manager->ShowDialog(window_);
 }
 
-GtkWidget* TabModalConfirmDialogGtk::GetWidgetRoot() {
-  return dialog_;
-}
-
-GtkWidget* TabModalConfirmDialogGtk::GetFocusWidget() {
-  return cancel_;
-}
-
-void TabModalConfirmDialogGtk::DeleteDelegate() {
-  delete this;
-}
-
 TabModalConfirmDialogGtk::~TabModalConfirmDialogGtk() {
   gtk_widget_destroy(dialog_);
 }
@@ -114,3 +104,7 @@ void TabModalConfirmDialogGtk::OnAccept(GtkWidget* widget) {
 void TabModalConfirmDialogGtk::OnCancel(GtkWidget* widget) {
   delegate_->Cancel();
 }
+
+void TabModalConfirmDialogGtk::OnDestroy(GtkWidget* widget) {
+  delete this;
+}