WidgetDelegateView is its own contents view.

ash/common/system/tray/system_tray_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/system/tray/system_tray.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/common/accelerators/accelerator_controller.h"
@@ skipping 33 matching lines @@
 namespace {
 
 const char kVisibleRowsHistogramName[] =
     "Ash.SystemMenu.DefaultView.VisibleRows";
 
 class ModalWidgetDelegate : public views::WidgetDelegateView {
  public:
   ModalWidgetDelegate() {}
   ~ModalWidgetDelegate() override {}
 
-  views::View* GetContentsView() override { return this; }
   ui::ModalType GetModalType() const override { return ui::MODAL_TYPE_SYSTEM; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ModalWidgetDelegate);
 };
 
 }  // namespace
 
 typedef AshTestBase SystemTrayTest;
 
@@ skipping 575 matching lines @@
   // Hide the default view, ensure the tray bubble height is back to zero.
   ASSERT_TRUE(tray->CloseSystemBubble());
   RunAllPendingInMessageLoop();
 
   EXPECT_EQ(0, notification_tray->tray_bubble_height_for_test());
 }
 #endif  // OS_CHROMEOS
 
 }  // namespace test
 }  // namespace ash