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

chrome/installer/util/shell_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.
 //
 // 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 1159 matching lines @@
   DCHECK_GE(base::win::GetVersion(), base::win::VERSION_WIN8);
 
   base::FilePath folder;
   if (!PathService::Get(base::DIR_APP_SHORTCUTS, &folder)) {
     LOG(ERROR) << "Could not get application shortcuts location.";
     return false;
   }
 
   folder = folder.Append(
       ShellUtil::GetBrowserModelId(dist, level == ShellUtil::CURRENT_USER));
-  if (!file_util::DirectoryExists(folder)) {
+  if (!base::DirectoryExists(folder)) {
     VLOG(1) << "No start screen shortcuts.";
     return false;
   }
 
   *path = folder;
   return true;
 }
 
 typedef base::Callback<bool(const base::FilePath&)> FileOperationCallback;
 
@@ skipping 890 matching lines @@
     // are any left...).
     if (free_bits >= 8 && next_byte_index < size) {
       free_bits -= 8;
       bit_stream += bytes[next_byte_index++] << free_bits;
     }
   }
 
   DCHECK_EQ(ret.length(), encoded_length);
   return ret;
 }