WidgetDelegateView is its own contents view.

ash/extended_desktop_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/aura/wm_window_aura.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/wm/root_window_finder.h"
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
@@ skipping 31 matching lines @@
   Shell::GetInstance()->display_manager()->SetLayoutForCurrentDisplays(
       std::move(layout));
 }
 
 class ModalWidgetDelegate : public views::WidgetDelegateView {
  public:
   ModalWidgetDelegate() {}
   ~ModalWidgetDelegate() override {}
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   ui::ModalType GetModalType() const override { return ui::MODAL_TYPE_SYSTEM; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ModalWidgetDelegate);
 };
 
 // An event handler which moves the target window to the secondary root window
 // at pre-handle phase of a mouse release event.
 class MoveWindowByClickEventHandler : public ui::EventHandler {
  public:
@@ skipping 865 matching lines @@
   generator.ReleaseLeftButton();
   EXPECT_EQ("-999,-999 -999,-999", event_handler.GetLocationsAndReset());
 
   generator.MoveMouseTo(400, 150);
   EXPECT_EQ("100,150 100,150", event_handler.GetLocationsAndReset());
 
   ash::Shell::GetInstance()->RemovePreTargetHandler(&event_handler);
 }
 
 }  // namespace ash