WidgetDelegateView is its own contents view.

ash/touch_hud/mus/touch_hud_application.cc

 // Copyright 2016 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/touch_hud/mus/touch_hud_application.h"
 
 #include "ash/public/interfaces/container.mojom.h"
 #include "ash/touch_hud/touch_hud_renderer.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 24 matching lines @@
     window_manager_connection_->pointer_watcher_event_router()
         ->AddPointerWatcher(this, true /* want_moves */);
   }
   ~TouchHudUI() override {
     window_manager_connection_->pointer_watcher_event_router()
         ->RemovePointerWatcher(this);
   }
 
  private:
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   base::string16 GetWindowTitle() const override {
     // TODO(beng): use resources.
     return base::ASCIIToUTF16("TouchHud");
   }
 
   // Overridden from views::PointerWatcher:
   void OnPointerEventObserved(const ui::PointerEvent& event,
                               const gfx::Point& location_in_screen,
                               views::Widget* target) override {
     if (event.IsTouchPointerEvent())
@@ skipping 51 matching lines @@
 }
 
 void TouchHudApplication::Create(const shell::Identity& remote_identity,
                                  mash::mojom::LaunchableRequest request) {
   binding_.Close();
   binding_.Bind(std::move(request));
 }
 
 }  // namespace touch_hud
 }  // namespace ash