WidgetDelegateView is its own contents view.

ash/wm/system_modal_container_layout_manager_unittest.cc

 // 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.
 
 #include "ash/common/wm/system_modal_container_layout_manager.h"
 
 #include <memory>
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 66 matching lines @@
   // The window needs be closed from widget in order for
   // aura::client::kModalKey property to be reset.
   static void CloseTestWindow(aura::Window* window) {
     views::Widget::GetWidgetForNativeWindow(window)->Close();
   }
 
   // Overridden from views::View:
   gfx::Size GetPreferredSize() const override { return gfx::Size(50, 50); }
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   ui::ModalType GetModalType() const override {
     return modal_ ? ui::MODAL_TYPE_SYSTEM : ui::MODAL_TYPE_NONE;
   }
 
  private:
   bool modal_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWindow);
 };
 
@@ skipping 799 matching lines @@
   if (!SupportsMultipleDisplays())
     return;
 
   UpdateDisplay("500x500, 500x500");
   InputTestDelegate delegate;
   delegate.RunTest(this);
 }
 
 }  // namespace test
 }  // namespace ash