Revert of Remove DialogDelegate::OnClosed() which is redundant with

components/app_modal/views/javascript_app_modal_dialog_views.cc

Index: components/app_modal/views/javascript_app_modal_dialog_views.cc
diff --git a/components/app_modal/views/javascript_app_modal_dialog_views.cc b/components/app_modal/views/javascript_app_modal_dialog_views.cc
index a56abe26cfb15bd1070679225880d9ab607cb6a9..b45ccbd6633ad27e042f5c01e6e956b6bae4b790 100644
--- a/components/app_modal/views/javascript_app_modal_dialog_views.cc
+++ b/components/app_modal/views/javascript_app_modal_dialog_views.cc
@@ -111,6 +111,18 @@
   return true;
 }
 
+void JavaScriptAppModalDialogViews::OnClosed() {
+  parent_->OnClose();
+}
+
+views::Widget* JavaScriptAppModalDialogViews::GetWidget() {
+  return message_box_view_->GetWidget();
+}
+
+const views::Widget* JavaScriptAppModalDialogViews::GetWidget() const {
+  return message_box_view_->GetWidget();
+}
+
 base::string16 JavaScriptAppModalDialogViews::GetDialogButtonLabel(
     ui::DialogButton button) const {
   if (parent_->is_before_unload_dialog()) {
@@ -146,16 +158,4 @@
   return views::DialogDelegate::GetInitiallyFocusedView();
 }
 
-void JavaScriptAppModalDialogViews::WindowClosing() {
-  parent_->OnClose();
-}
-
-views::Widget* JavaScriptAppModalDialogViews::GetWidget() {
-  return message_box_view_->GetWidget();
-}
-
-const views::Widget* JavaScriptAppModalDialogViews::GetWidget() const {
-  return message_box_view_->GetWidget();
-}
-
 }  // namespace app_modal