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

chrome/installer/setup/uninstall.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.
 //
 // This file declares Chrome uninstall related functions.
 
 #ifndef CHROME_INSTALLER_SETUP_UNINSTALL_H_
 #define CHROME_INSTALLER_SETUP_UNINSTALL_H_
 
 #include <shlobj.h>
@@ skipping 42 matching lines @@
 // longer needed. This is used during autoupdate since we don't do full
 // uninstalls/reinstalls to update.
 void RemoveChromeLegacyRegistryKeys(BrowserDistribution* dist,
                                     const base::string16& chrome_exe);
 
 // This function uninstalls a product.  Hence we came up with this awesome
 // name for it.
 //
 // original_state: The installation state of all products on the system.
 // installer_state: State associated with this operation.
-// setup_path: Path to the executable (setup.exe) as it will be copied
-//           to temp folder before deleting Chrome folder.
+// setup_exe: The path to the currently running setup.exe. It and its containing
+//     directories are left in-place if it is within the target directory of
+//     the product being uninstalled.
 // dist: Represents the distribution to be uninstalled.
 // remove_all: Remove all shared files, registry entries as well.
 // force_uninstall: Uninstall without prompting for user confirmation or
 //                  any checks for Chrome running.
 // cmd_line: CommandLine that contains information about the command that
 //           was used to launch current uninstaller.
 installer::InstallStatus UninstallProduct(
     const InstallationState& original_state,
     const InstallerState& installer_state,
-    const base::FilePath& setup_path,
+    const base::FilePath& setup_exe,
     const Product& dist,
     bool remove_all,
     bool force_uninstall,
     const CommandLine& cmd_line);
 
 // Cleans up the installation directory after all uninstall operations have
 // completed. Depending on what products are remaining, setup.exe and the
 // installer archive may be deleted. Empty directories will be pruned (or
 // scheduled for pruning after reboot, if necessary).
 //
 // original_state: The installation state of all products on the system.
 // installer_state: State associated with this operation.
-// cmd_line: CommandLine that contains information about the command that
-//           was used to launch current uninstaller.
+// setup_exe: The path to the currently running setup.exe, which will be moved
+//     into a temporary directory to allow for deletion of the installation
+//     directory.
 // uninstall_status: the uninstall status so far (may change during invocation).
 void CleanUpInstallationDirectoryAfterUninstall(
     const InstallationState& original_state,
     const InstallerState& installer_state,
-    const CommandLine& cmd_line,
+    const base::FilePath& setup_exe,
     InstallStatus* uninstall_status);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_UNINSTALL_H_