Move PathExists to base namespace.

chrome/installer/util/install_util.cc

 // 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.
 //
 // See the corresponding header file for description of the functions in this
 // file.
 
 #include "chrome/installer/util/install_util.h"
 
 #include <shellapi.h>
@@ skipping 367 matching lines @@
 
 bool InstallUtil::GetSentinelFilePath(const base::FilePath::CharType* file,
                                       BrowserDistribution* dist,
                                       base::FilePath* path) {
   base::FilePath exe_path;
   if (!PathService::Get(base::DIR_EXE, &exe_path))
     return false;
 
   if (IsPerUserInstall(exe_path.value().c_str())) {
     const base::FilePath maybe_product_dir(exe_path.DirName().DirName());
-    if (file_util::PathExists(exe_path.Append(installer::kChromeExe))) {
+    if (base::PathExists(exe_path.Append(installer::kChromeExe))) {
       // DIR_EXE is most likely Chrome's directory in which case |exe_path| is
       // the user-level sentinel path.
       *path = exe_path;
-    } else if (file_util::PathExists(
+    } else if (base::PathExists(
                    maybe_product_dir.Append(installer::kChromeExe))) {
       // DIR_EXE can also be the Installer directory if this is called from a
       // setup.exe running from Application\<version>\Installer (see
       // InstallerState::GetInstallerDirectory) in which case Chrome's directory
       // is two levels up.
       *path = maybe_product_dir;
     } else {
       NOTREACHED();
       return false;
     }
@@ skipping 200 matching lines @@
   // Open the program and see if it references the expected file.
   base::win::ScopedHandle handle;
   BY_HANDLE_FILE_INFORMATION info = {};
 
   return (OpenForInfo(path, &handle) &&
           GetInfo(handle, &info) &&
           info.dwVolumeSerialNumber == file_info_.dwVolumeSerialNumber &&
           info.nFileIndexHigh == file_info_.nFileIndexHigh &&
           info.nFileIndexLow == file_info_.nFileIndexLow);
 }