Use BookmarkAppConfirmationView on Mac. Delete the NSAlert Mac uses currently.

chrome/browser/ui/views/extensions/bookmark_app_confirmation_view.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_EXTENSIONS_BOOKMARK_APP_CONFIRMATION_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTENSIONS_BOOKMARK_APP_CONFIRMATION_VIEW_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
-#include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/common/web_application_info.h"
 #include "ui/views/controls/textfield/textfield_controller.h"
 #include "ui/views/window/dialog_delegate.h"
 
 namespace views {
 class Checkbox;
 class Textfield;
 }
 
 // BookmarkAppConfirmationView provides views for editing the details to
 // create a bookmark app with. (More tools > Add to desktop)
 class BookmarkAppConfirmationView : public views::DialogDelegateView,
                                     public views::TextfieldController {
  public:
+  BookmarkAppConfirmationView(const WebApplicationInfo& web_app_info,
+                              chrome::ShowBookmarkAppDialogCallback callback);
   ~BookmarkAppConfirmationView() override;
 
-  static void CreateAndShow(
-      gfx::NativeWindow parent,
-      const WebApplicationInfo& web_app_info,
-      const BrowserWindow::ShowBookmarkAppBubbleCallback& callback);
-
  private:
-  BookmarkAppConfirmationView(
-      const WebApplicationInfo& web_app_info,
-      const BrowserWindow::ShowBookmarkAppBubbleCallback& callback);
-
   // Overridden from views::WidgetDelegate:
   views::View* GetInitiallyFocusedView() override;
   ui::ModalType GetModalType() const override;
   base::string16 GetWindowTitle() const override;
   bool ShouldShowCloseButton() const override;
   void WindowClosing() override;
 
   // Overriden from views::DialogDelegateView:
   bool Accept() override;
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   bool IsDialogButtonEnabled(ui::DialogButton button) const override;
 
   // Overridden from views::View:
   gfx::Size GetMinimumSize() const override;
 
   // Overridden from views::TextfieldController:
   void ContentsChanged(views::Textfield* sender,
                        const base::string16& new_contents) override;
 
   // Update the state of the Add button.
   void UpdateAddButtonState();
 
   // Get the trimmed contents of the title text field.
   base::string16 GetTrimmedTitle() const;
 
   // The WebApplicationInfo that the user is editing.
   WebApplicationInfo web_app_info_;
 
   // The callback to be invoked when the dialog is completed.
-  BrowserWindow::ShowBookmarkAppBubbleCallback callback_;
+  chrome::ShowBookmarkAppDialogCallback callback_;
 
   // Checkbox to launch as a window.
   views::Checkbox* open_as_window_checkbox_;
 
   // Textfield showing the title of the app.
   views::Textfield* title_tf_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkAppConfirmationView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTENSIONS_BOOKMARK_APP_CONFIRMATION_VIEW_H_