WidgetDelegateView is its own contents view.

chrome/browser/ui/views/ime/ime_window_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_VIEW_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 49 matching lines @@
   // ui::ImeNativeWindow:
   void Show() override;
   void Hide() override;
   void Close() override;
   void SetBounds(const gfx::Rect& bounds) override;
   gfx::Rect GetBounds() const override;
   void UpdateWindowIcon() override;
   bool IsVisible() const override;
 
   // views::WidgetDelegateView:
-  views::View* GetContentsView() override;
   views::NonClientFrameView* CreateNonClientFrameView(
       views::Widget* widget) override;
   bool CanActivate() const override;
   bool CanResize() const override;
   bool CanMaximize() const override;
   bool CanMinimize() const override;
   base::string16 GetWindowTitle() const override;
   gfx::ImageSkia GetWindowAppIcon() override;
   gfx::ImageSkia GetWindowIcon() override;
   void DeleteDelegate() override;
@@ skipping 19 matching lines @@
 
   // The web view control which hosts the web contents.
   views::WebView* web_view_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeWindowView);
 };
 
 }  // namespace ui
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_VIEW_H_