WidgetDelegateView is its own contents view.

ui/message_center/views/toast_contents_view.cc

 // Copyright (c) 2013 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/message_center/views/toast_contents_view.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 220 matching lines @@
 void ToastContentsView::AnimationEnded(const gfx::Animation* animation) {
   OnBoundsAnimationEndedOrCancelled(animation);
 }
 
 void ToastContentsView::AnimationCanceled(
     const gfx::Animation* animation) {
   OnBoundsAnimationEndedOrCancelled(animation);
 }
 
 // views::WidgetDelegate
-views::View* ToastContentsView::GetContentsView() {
-  return this;
-}
-
 void ToastContentsView::WindowClosing() {
   if (!is_closing_ && collection_.get())
     collection_->ForgetToast(this);
 }
 
 void ToastContentsView::OnDisplayChanged() {
   views::Widget* widget = GetWidget();
   if (!widget)
     return;
 
@@ skipping 128 matching lines @@
 }
 
 gfx::Rect ToastContentsView::GetClosedToastBounds(gfx::Rect bounds) {
   return gfx::Rect(bounds.x() + bounds.width() - kClosedToastWidth,
                    bounds.y(),
                    kClosedToastWidth,
                    bounds.height());
 }
 
 }  // namespace message_center