Remove some deprecated file_util wstring functions.

chrome/installer/util/shell_util.cc

 // Copyright (c) 2009 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 defines functions that integrate Chrome in Windows shell. These
 // functions can be used by Chrome as well as Chrome installer. All of the
 // work is done by the local functions defined in anonymous namespace in
 // this class.
 
 #include "chrome/installer/util/shell_util.h"
@@ skipping 277 matching lines @@
 }
 
 // This method registers Chrome on Vista by launching eleavated setup.exe.
 // That will show user standard Vista elevation prompt. If user accepts it
 // the new process will make the necessary changes and return SUCCESS that
 // we capture and return.
 bool ElevateAndRegisterChrome(const std::wstring& chrome_exe,
                               const std::wstring& suffix) {
   std::wstring exe_path(file_util::GetDirectoryFromPath(chrome_exe));
   file_util::AppendToPath(&exe_path, installer_util::kSetupExe);
-  if (!file_util::PathExists(exe_path)) {
+  if (!file_util::PathExists(FilePath::FromWStringHack(exe_path))) {
     BrowserDistribution* dist = BrowserDistribution::GetDistribution();
     HKEY reg_root = InstallUtil::IsPerUserInstall(chrome_exe.c_str()) ?
         HKEY_CURRENT_USER : HKEY_LOCAL_MACHINE;
     RegKey key(reg_root, dist->GetUninstallRegPath().c_str());
     key.ReadValue(installer_util::kUninstallStringField, &exe_path);
     CommandLine command_line(L"");
     command_line.ParseFromString(exe_path);
     exe_path = command_line.program();
   }
-  if (file_util::PathExists(exe_path)) {
+  if (file_util::PathExists(FilePath::FromWStringHack(exe_path))) {
     std::wstring params(L"--");
     params.append(installer_util::switches::kRegisterChromeBrowser);
     params.append(L"=\"" + chrome_exe + L"\"");
     if (!suffix.empty()) {
       params.append(L" --");
       params.append(installer_util::switches::kRegisterChromeBrowserSuffix);
       params.append(L"=\"" + suffix + L"\"");
     }
     DWORD ret_val = 0;
     InstallUtil::ExecuteExeAsAdmin(exe_path, params, &ret_val);
@@ skipping 453 matching lines @@
   } else {
     return file_util::UpdateShortcutLink(chrome_exe.c_str(),      // target
                                          shortcut.c_str(),        // shortcut
                                          chrome_path.c_str(),     // working dir
                                          NULL,                    // arguments
                                          description.c_str(),     // description
                                          chrome_exe.c_str(),      // icon file
                                          0);                      // icon index
   }
 }