WidgetDelegateView is its own contents view.

mash/screenlock/screenlock.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 "mash/screenlock/screenlock.h"
 
 #include "ash/public/interfaces/container.mojom.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mash/session/public/interfaces/session.mojom.h"
@@ skipping 18 matching lines @@
       : connector_(connector),
         unlock_button_(
             views::MdTextButton::Create(this, base::ASCIIToUTF16("Unlock"))) {
     set_background(views::Background::CreateSolidBackground(SK_ColorYELLOW));
     AddChildView(unlock_button_);
   }
   ~ScreenlockView() override {}
 
  private:
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   base::string16 GetWindowTitle() const override {
     // TODO(beng): use resources.
     return base::ASCIIToUTF16("Screenlock");
   }
 
   // Overridden from views::View:
   void Layout() override {
     gfx::Rect bounds = GetLocalBounds();
     bounds.Inset(10, 10);
 
@@ skipping 54 matching lines @@
   widget->Show();
 }
 
 void Screenlock::ScreenlockStateChanged(bool screen_locked) {
   if (!screen_locked)
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
 }  // namespace screenlock
 }  // namespace mash