Sandbox the component updater's patcher utility process.

chrome/common/chrome_utility_messages.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.
 
 // Multiply-included message file, so no include guard.
 
 #if defined(OS_WIN)
 #include <Windows.h>
 #endif  // defined(OS_WIN)
 
@@ skipping 126 matching lines @@
 #endif  // OS_WIN
 
 //------------------------------------------------------------------------------
 // Utility process messages:
 // These are messages from the browser to the utility process.
 
 // Tell the utility process to patch the given |input_file| using |patch_file|
 // and place the output in |output_file|. The patch should use the bsdiff
 // algorithm (Courgette's version).
 IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_PatchFileBsdiff,
-                     base::FilePath /* input_file */,
-                     base::FilePath /* patch_file */,
-                     base::FilePath /* output_file */)
+                     IPC::PlatformFileForTransit /* input_file */,
+                     IPC::PlatformFileForTransit /* patch_file */,
+                     IPC::PlatformFileForTransit /* output_file */)
 
 // Tell the utility process to patch the given |input_file| using |patch_file|
 // and place the output in |output_file|. The patch should use the Courgette
 // algorithm.
 IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_PatchFileCourgette,
-                     base::FilePath /* input_file */,
-                     base::FilePath /* patch_file */,
-                     base::FilePath /* output_file */)
+                     IPC::PlatformFileForTransit /* input_file */,
+                     IPC::PlatformFileForTransit /* patch_file */,
+                     IPC::PlatformFileForTransit /* output_file */)
 
 #if defined(OS_CHROMEOS)
 // Tell the utility process to create a zip file on the given list of files.
 IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_CreateZipFile,
                      base::FilePath /* src_dir */,
                      std::vector<base::FilePath> /* src_relative_paths */,
                      base::FileDescriptor /* dest_fd */)
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(FULL_SAFE_BROWSING)
@@ skipping 69 matching lines @@
 #if defined(OS_WIN)
 IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_GetOpenFileName_Failed)
 IPC_MESSAGE_CONTROL2(ChromeUtilityHostMsg_GetOpenFileName_Result,
                      base::FilePath /* directory */,
                      std::vector<base::FilePath> /* filenames */)
 IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_GetSaveFileName_Failed)
 IPC_MESSAGE_CONTROL2(ChromeUtilityHostMsg_GetSaveFileName_Result,
                      base::FilePath /* path */,
                      int /* one_based_filter_index  */)
 #endif  // defined(OS_WIN)