WidgetDelegateView is its own contents view.

ash/shell/widgets.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 "base/strings/utf_string_conversions.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/controls/button/checkbox.h"
@@ skipping 17 matching lines @@
  public:
   WidgetsWindow();
   ~WidgetsWindow() override;
 
   // Overridden from views::View:
   void OnPaint(gfx::Canvas* canvas) override;
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override;
   base::string16 GetWindowTitle() const override;
   bool CanResize() const override;
 
  private:
   views::LabelButton* button_;
   views::LabelButton* disabled_button_;
   views::Checkbox* checkbox_;
   views::Checkbox* checkbox_disabled_;
   views::Checkbox* checkbox_checked_;
   views::Checkbox* checkbox_checked_disabled_;
@@ skipping 63 matching lines @@
     gfx::Size preferred = view->GetPreferredSize();
     view->SetBounds(left, top, preferred.width(), preferred.height());
     top += preferred.height() + kVerticalPad;
   }
 }
 
 gfx::Size WidgetsWindow::GetPreferredSize() const {
   return gfx::Size(kWindowWidth, kWindowHeight);
 }
 
-views::View* WidgetsWindow::GetContentsView() {
-  return this;
-}
-
 base::string16 WidgetsWindow::GetWindowTitle() const {
   return base::ASCIIToUTF16("Examples: Widgets");
 }
 
 bool WidgetsWindow::CanResize() const {
   return true;
 }
 
 }  // namespace
 
 namespace ash {
 namespace shell {
 
 void CreateWidgetsWindow() {
   gfx::Rect bounds(kWindowLeft, kWindowTop, kWindowWidth, kWindowHeight);
   views::Widget* widget = views::Widget::CreateWindowWithContextAndBounds(
       new WidgetsWindow, Shell::GetPrimaryRootWindow(), bounds);
   widget->GetNativeView()->SetName("WidgetsWindow");
   widget->Show();
 }
 
 }  // namespace shell
 }  // namespace ash