Experimentally isolate OpenItemViaShell in a utility process.

chrome/utility/shell_handler_win.h

 // Copyright (c) 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_UTILITY_SHELL_HANDLER_WIN_H_
 #define CHROME_UTILITY_SHELL_HANDLER_WIN_H_
 
 #include <Windows.h>
 
 #include <vector>
@@ skipping 16 matching lines @@
 // in a non-sandboxed utility process.
 class ShellHandler : public UtilityMessageHandler {
  public:
   ShellHandler();
   virtual ~ShellHandler();
 
   // IPC::Listener implementation
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
+  void OnOpenItemViaShell(const base::FilePath& full_path);
   void OnGetOpenFileName(
     HWND owner,
     DWORD flags,
     const GetOpenFileNameFilter& filter,
     const base::FilePath& initial_directory,
     const base::FilePath& filename);
 
   DISALLOW_COPY_AND_ASSIGN(ShellHandler);
 };
 
 #endif  // CHROME_UTILITY_SHELL_HANDLER_WIN_H_