Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

chrome/installer/util/delete_after_reboot_helper.cc

 // Copyright (c) 2010 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 helper methods used to schedule files for deletion
 // on next reboot. The code here is heavily borrowed and simplified from
 //  http://code.google.com/p/omaha/source/browse/trunk/common/file.cc and
 //  http://code.google.com/p/omaha/source/browse/trunk/common/utils.cc
 //
 // This implementation really is not fast, so do not use it where that will
@@ skipping 45 matching lines @@
 // Must only be called for regular files or directories that will be empty.
 bool ScheduleFileSystemEntityForDeletion(const wchar_t* path) {
   // Check if the file exists, return false if not.
   WIN32_FILE_ATTRIBUTE_DATA attrs = {0};
   if (!::GetFileAttributesEx(path, ::GetFileExInfoStandard, &attrs)) {
     PLOG(WARNING) << path << " does not exist.";
     return false;
   }
 
   DWORD flags = MOVEFILE_DELAY_UNTIL_REBOOT;
-  if (!file_util::DirectoryExists(base::FilePath::FromWStringHack(path))) {
+  if (!base::DirectoryExists(base::FilePath::FromWStringHack(path))) {
     // This flag valid only for files
     flags |= MOVEFILE_REPLACE_EXISTING;
   }
 
   if (!::MoveFileEx(path, NULL, flags)) {
     PLOG(ERROR) << "Could not schedule " << path << " for deletion.";
     return false;
   }
 
 #ifndef NDEBUG
@@ skipping 307 matching lines @@
         ERROR_SUCCESS);
   }
   std::vector<char> buffer;
   StringArrayToMultiSZBytes(strings_to_keep, &buffer);
   DCHECK_GT(buffer.size(), 0U);
   if (buffer.empty())
     return false;
   return (session_manager_key.WriteValue(kPendingFileRenameOps, &buffer[0],
       buffer.size(), REG_MULTI_SZ) == ERROR_SUCCESS);
 }