Revive experiment to isolate shell operations.

chrome/utility/ipc_shell_handler_win.h

Index: chrome/utility/ipc_shell_handler_win.h
diff --git a/chrome/utility/ipc_shell_handler_win.h b/chrome/utility/ipc_shell_handler_win.h
deleted file mode 100644
index 5c71df7bdfc3aaa9aae701a4b36219760076f42f..0000000000000000000000000000000000000000
--- a/chrome/utility/ipc_shell_handler_win.h
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 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_IPC_SHELL_HANDLER_WIN_H_
-#define CHROME_UTILITY_IPC_SHELL_HANDLER_WIN_H_
-
-#include <Windows.h>
-
-#include <tuple>
-#include <vector>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/strings/string16.h"
-#include "chrome/utility/utility_message_handler.h"
-
-namespace base {
-class FilePath;
-}  // namespace base
-
-using GetOpenFileNameFilter =
-    std::vector<std::tuple<base::string16, base::string16>>;
-
-struct ChromeUtilityMsg_GetSaveFileName_Params;
-
-// Handles requests to execute shell operations. Used to protect the browser
-// process from instability due to 3rd-party shell extensions. Must be invoked
-// in a non-sandboxed utility process.
-// Note: This class is deprecated in favor of the Mojo version.
-//       See chrome/common/shell_handler_win.mojom and
-//       chrome/utility/shell_handler_impl_win.h
-class IPCShellHandler : public UtilityMessageHandler {
- public:
-  IPCShellHandler();
-  ~IPCShellHandler() override;
-
-  // IPC::Listener implementation
-  bool OnMessageReceived(const IPC::Message& message) override;
-
- private:
-  void OnGetOpenFileName(HWND owner,
-                         DWORD flags,
-                         const GetOpenFileNameFilter& filter,
-                         const base::FilePath& initial_directory,
-                         const base::FilePath& filename);
-
-  void OnGetSaveFileName(const ChromeUtilityMsg_GetSaveFileName_Params& params);
-
-  DISALLOW_COPY_AND_ASSIGN(IPCShellHandler);
-};
-
-#endif  // CHROME_UTILITY_IPC_SHELL_HANDLER_WIN_H_