Clean up views content example a little more.

ui/views/examples/content_client/examples_content_browser_client.h

 // Copyright (c) 2012 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 UI_VIEWS_EXAMPLES_CONTENT_CLIENT_EXAMPLES_CONTENT_BROWSER_CLIENT_H_
 #define UI_VIEWS_EXAMPLES_CONTENT_CLIENT_EXAMPLES_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/content_browser_client.h"
 
 namespace content {
 class ShellBrowserContext;
-class ShellBrowserMainParts;
 }
 
 namespace views {
 namespace examples {
 
 class ExamplesBrowserMainParts;
 
 class ExamplesContentBrowserClient : public content::ContentBrowserClient {
  public:
   ExamplesContentBrowserClient();
   virtual ~ExamplesContentBrowserClient();
 
   // Overridden from content::ContentBrowserClient:
   virtual content::BrowserMainParts* CreateBrowserMainParts(
       const content::MainFunctionParams& parameters) OVERRIDE;
 
   content::ShellBrowserContext* browser_context();
 
  private:
   ExamplesBrowserMainParts* examples_browser_main_parts_;
 
   DISALLOW_COPY_AND_ASSIGN(ExamplesContentBrowserClient);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_CONTENT_CLIENT_EXAMPLES_CONTENT_BROWSER_CLIENT_H_