WidgetDelegateView is its own contents view.

ash/shell_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/shell.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 78 matching lines @@
       Shell::GetContainer(root_window, kShellWindowId_MouseCursorContainer));
 #endif
 }
 
 class ModalWindow : public views::WidgetDelegateView {
  public:
   ModalWindow() {}
   ~ModalWindow() override {}
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   bool CanResize() const override { return true; }
   base::string16 GetWindowTitle() const override {
     return base::ASCIIToUTF16("Modal Window");
   }
   ui::ModalType GetModalType() const override { return ui::MODAL_TYPE_SYSTEM; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ModalWindow);
 };
 
@@ skipping 394 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellTest2);
 };
 
 TEST_F(ShellTest2, DontCrashWhenWindowDeleted) {
   window_.reset(new aura::Window(NULL));
   window_->Init(ui::LAYER_NOT_DRAWN);
 }
 
 }  // namespace ash