WidgetDelegateView is its own contents view.

content/shell/browser/shell_views.cc

 // Copyright 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 "content/shell/browser/shell.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 233 matching lines @@
   bool CanResize() const override { return true; }
   bool CanMaximize() const override { return true; }
   bool CanMinimize() const override { return true; }
   base::string16 GetWindowTitle() const override { return title_; }
   void WindowClosing() override {
     if (shell_) {
       delete shell_;
       shell_ = NULL;
     }
   }
-  View* GetContentsView() override { return this; }
 
   // Overridden from View
   gfx::Size GetMinimumSize() const override {
     // We want to be able to make the window smaller than its initial
     // (preferred) size.
     return gfx::Size();
   }
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override {
     if (details.is_add && details.child == this) {
@@ skipping 177 matching lines @@
 void Shell::PlatformSetTitle(const base::string16& title) {
   if (headless_)
     return;
   ShellWindowDelegateView* delegate_view =
     static_cast<ShellWindowDelegateView*>(window_widget_->widget_delegate());
   delegate_view->SetWindowTitle(title);
   window_widget_->UpdateWindowTitle();
 }
 
 }  // namespace content