WidgetDelegateView is its own contents view.

extensions/components/native_app_window/native_app_window_views.cc

 // Copyright 2014 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 "extensions/components/native_app_window/native_app_window_views.h"
 
 #include "base/threading/sequenced_worker_pool.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
@@ skipping 236 matching lines @@
 }
 
 views::Widget* NativeAppWindowViews::GetWidget() {
   return widget_;
 }
 
 const views::Widget* NativeAppWindowViews::GetWidget() const {
   return widget_;
 }
 
-views::View* NativeAppWindowViews::GetContentsView() {
-  return this;
-}
-
 bool NativeAppWindowViews::ShouldDescendIntoChildForEventHandling(
     gfx::NativeView child,
     const gfx::Point& location) {
 #if defined(USE_AURA)
   if (child->Contains(web_view_->web_contents()->GetNativeView())) {
     // App window should claim mouse events that fall within the draggable
     // region.
     return !draggable_region_.get() ||
            !draggable_region_->contains(location.x(), location.y());
   }
@@ skipping 168 matching lines @@
 
 bool NativeAppWindowViews::CanHaveAlphaEnabled() const {
   return widget_->IsTranslucentWindowOpacitySupported();
 }
 
 void NativeAppWindowViews::SetVisibleOnAllWorkspaces(bool always_visible) {
   widget_->SetVisibleOnAllWorkspaces(always_visible);
 }
 
 }  // namespace native_app_window