WidgetDelegateView is its own contents view.

ash/test/child_modal_window.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 ASH_TEST_CHILD_MODAL_WINDOW_H_
 #define ASH_TEST_CHILD_MODAL_WINDOW_H_
 
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/widget/widget_delegate.h"
@@ skipping 20 matching lines @@
   ~ChildModalParent() override;
 
   void ShowChild();
   gfx::NativeWindow GetModalParent() const;
   gfx::NativeWindow GetChild() const;
 
  private:
   views::Widget* CreateChild();
 
   // Overridden from views::WidgetDelegate:
-  View* GetContentsView() override;
   base::string16 GetWindowTitle() const override;
   bool CanResize() const override;
   void DeleteDelegate() override;
 
   // Overridden from views::View:
   void Layout() override;
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
   // Overridden from ButtonListener:
@@ skipping 19 matching lines @@
   // The child window.
   views::Widget* child_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildModalParent);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_CHILD_MODAL_WINDOW_H_