WidgetDelegateView is its own contents view.

ui/views/examples/examples_window.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 "ui/views/examples/examples_window.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 165 matching lines @@
   static ExamplesWindowContents* instance() { return instance_; }
 
  private:
   // WidgetDelegateView:
   bool CanResize() const override { return true; }
   bool CanMaximize() const override { return true; }
   bool CanMinimize() const override { return true; }
   base::string16 GetWindowTitle() const override {
     return base::ASCIIToUTF16("Views Examples");
   }
-  View* GetContentsView() override { return this; }
   void WindowClosing() override {
     instance_ = NULL;
     if (operation_ == QUIT_ON_CLOSE)
       base::MessageLoop::current()->QuitWhenIdle();
   }
   gfx::Size GetPreferredSize() const override { return gfx::Size(800, 300); }
 
   // ComboboxListener:
   void OnPerformAction(Combobox* combobox) override {
     DCHECK_EQ(combobox, combobox_);
@@ skipping 35 matching lines @@
     widget->Show();
   }
 }
 
 void LogStatus(const std::string& string) {
   ExamplesWindowContents::instance()->SetStatus(string);
 }
 
 }  // namespace examples
 }  // namespace views