WidgetDelegateView is its own contents view.

mash/catalog_viewer/catalog_viewer.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/catalog_viewer/catalog_viewer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 54 matching lines @@
  private:
   struct Entry {
     Entry(const std::string& name, const std::string& url)
         : name(name), url(url) {}
     std::string name;
     std::string url;
   };
 
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   base::string16 GetWindowTitle() const override {
     // TODO(beng): use resources.
     return base::ASCIIToUTF16("Applications");
   }
   bool CanResize() const override { return true; }
   bool CanMaximize() const override { return true; }
   bool CanMinimize() const override { return true; }
 
   gfx::ImageSkia GetWindowAppIcon() override {
     // TODO(jamescook): Create a new .pak file for this app and make a custom
@@ skipping 112 matching lines @@
   windows_.push_back(window);
 }
 
 void CatalogViewer::Create(const shell::Identity& remote_identity,
                            mojom::LaunchableRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace catalog_viewer
 }  // namespace mash