WidgetDelegateView is its own contents view.

ash/shell/window_type_launcher.h

 // Copyright (c) 2012 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 ASH_SHELL_WINDOW_TYPE_LAUNCHER_H_
 #define ASH_SHELL_WINDOW_TYPE_LAUNCHER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 25 matching lines @@
   enum MenuCommands {
     COMMAND_NEW_WINDOW = 1,
     COMMAND_TOGGLE_FULLSCREEN = 3,
   };
 
   // Overridden from views::View:
   void OnPaint(gfx::Canvas* canvas) override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override;
   bool CanResize() const override;
   base::string16 GetWindowTitle() const override;
   bool CanMaximize() const override;
   bool CanMinimize() const override;
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // Overridden from views::MenuDelegate:
   void ExecuteCommand(int id, int event_flags) override;
@@ skipping 18 matching lines @@
   views::Button* show_web_notification_;
   std::unique_ptr<views::MenuRunner> menu_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTypeLauncher);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_WINDOW_TYPE_LAUNCHER_H_