WidgetDelegateView is its own contents view.

mash/task_viewer/task_viewer.cc

 // Copyright 2015 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/task_viewer/task_viewer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 65 matching lines @@
   struct InstanceInfo {
     InstanceInfo(const shell::Identity& identity, base::ProcessId pid)
         : identity(identity), pid(pid) {}
     shell::Identity identity;
     uint32_t pid;
     std::string display_name;
   };
 
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   base::string16 GetWindowTitle() const override {
     // TODO(beng): use resources.
     return base::ASCIIToUTF16("Tasks");
   }
   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 227 matching lines @@
   windows_.push_back(window);
 }
 
 void TaskViewer::Create(const shell::Identity& remote_identity,
                         mojom::LaunchableRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace task_viewer
 }  // namespace main