WidgetDelegateView is its own contents view.

chrome/browser/chromeos/login/ui/simple_web_view_dialog.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_SIMPLE_WEB_VIEW_DIALOG_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_SIMPLE_WEB_VIEW_DIALOG_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 41 matching lines @@
   // Starts loading.
   void StartLoad(const GURL& gurl);
 
   // Inits view. Should be attached to a Widget before call.
   void Init();
 
   // Overridden from views::View:
   void Layout() override;
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override;
   views::View* GetInitiallyFocusedView() override;
 
   // Implements views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // Implements content::PageNavigator:
   content::WebContents* OpenURL(const content::OpenURLParams& params) override;
 
   // Implements content::WebContentsDelegate:
   void NavigationStateChanged(content::WebContents* source,
@@ skipping 44 matching lines @@
   std::unique_ptr<views::WebView> web_view_container_;
 
   std::unique_ptr<StubBubbleModelDelegate> bubble_model_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleWebViewDialog);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_SIMPLE_WEB_VIEW_DIALOG_H_