Determine the path to setup.exe via PathService rather than the parsed

chrome/installer/setup/setup_main.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.
 
 // This header exists as a starting point for extracting some of the
 // logic out of setup_main.cc.
 
 #ifndef CHROME_INSTALLER_SETUP_SETUP_MAIN_H_
 #define CHROME_INSTALLER_SETUP_SETUP_MAIN_H_
 
 #include "chrome/installer/util/util_constants.h"
 
 class CommandLine;
 
 namespace base {
 class FilePath;
 }  // namespace base
 
 namespace installer {
 class InstallationState;
 class InstallerState;
 class MasterPreferences;
 
 // Helper function that performs the installation of a set of products.
 // |installer_directory|, if non-NULL, is populated with the path to the
 // directory containing the newly installed setup.exe. |archive_type| is
 // populated with the type of archive found. |delegated_to_existing| is set to
 // |true| if installation was delegated to a pre-existing higher version.
 InstallStatus InstallProductsHelper(const InstallationState& original_state,
+                                    const base::FilePath& setup_exe,
                                     const CommandLine& cmd_line,
                                     const MasterPreferences& prefs,
                                     const InstallerState& installer_state,
                                     base::FilePath* installer_directory,
                                     ArchiveType* archive_type,
                                     bool* delegated_to_existing);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_SETUP_MAIN_H_