Update {virtual,override} to follow C++11 style in content.

content/shell/browser/shell_content_browser_client.h

 // 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.
 
 #ifndef CONTENT_SHELL_BROWSER_SHELL_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_SHELL_BROWSER_SHELL_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 60 matching lines @@
                const OpenURLParams& params,
                const base::Callback<void(WebContents*)>& callback) override;
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   void GetAdditionalMappedFilesForChildProcess(
       const base::CommandLine& command_line,
       int child_process_id,
       FileDescriptorInfo* mappings) override;
 #endif
 #if defined(OS_WIN)
-  virtual void PreSpawnRenderer(sandbox::TargetPolicy* policy,
-                                bool* success) override;
+  void PreSpawnRenderer(sandbox::TargetPolicy* policy, bool* success) override;
 #endif
 
   ShellBrowserContext* browser_context();
   ShellBrowserContext* off_the_record_browser_context();
   ShellResourceDispatcherHostDelegate* resource_dispatcher_host_delegate() {
     return resource_dispatcher_host_delegate_.get();
   }
   ShellBrowserMainParts* shell_browser_main_parts() {
     return shell_browser_main_parts_;
   }
@@ skipping 17 matching lines @@
 #endif
 
   base::Closure select_client_certificate_callback_;
 
   ShellBrowserMainParts* shell_browser_main_parts_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_SHELL_CONTENT_BROWSER_CLIENT_H_