Move AppendFile and *CurrentDirectory to the base namespace.

tools/gn/setup.cc

 // Copyright (c) 2013 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.
 
 #include "tools/gn/setup.h"
 
 #include <stdlib.h>
 
 #include <algorithm>
 
@@ skipping 256 matching lines @@
   // Find the .gn file.
   base::FilePath root_path;
 
   // Prefer the command line args to the config file.
   base::FilePath relative_root_path = cmdline.GetSwitchValuePath(kSwitchRoot);
   if (!relative_root_path.empty()) {
     root_path = base::MakeAbsoluteFilePath(relative_root_path);
     dotfile_name_ = root_path.Append(kGnFile);
   } else {
     base::FilePath cur_dir;
-    file_util::GetCurrentDirectory(&cur_dir);
+    base::GetCurrentDirectory(&cur_dir);
     dotfile_name_ = FindDotFile(cur_dir);
     if (dotfile_name_.empty()) {
       Err(Location(), "Can't find source root.",
           "I could not find a \".gn\" file in the current directory or any "
           "parent,\nand the --root command-line argument was not specified.")
           .PrintToStdout();
       return false;
     }
     root_path = dotfile_name_.DirName();
   }
@@ skipping 145 matching lines @@
 }
 
 void DependentSetup::RunPreMessageLoop() {
   CommonSetup::RunPreMessageLoop();
 }
 
 bool DependentSetup::RunPostMessageLoop() {
   return CommonSetup::RunPostMessageLoop();
 }