Move directory creation functions to base namespace.

tools/gn/ninja_build_writer.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/ninja_build_writer.h"
 
 #include <fstream>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 93 matching lines @@
 
 // static
 bool NinjaBuildWriter::RunAndWriteFile(
     const BuildSettings* build_settings,
     const std::vector<const Settings*>& all_settings,
     const std::vector<const Target*>& default_toolchain_targets) {
   ScopedTrace trace(TraceItem::TRACE_FILE_WRITE, "build.ninja");
 
   base::FilePath ninja_file(build_settings->GetFullPath(
       SourceFile(build_settings->build_dir().value() + "build.ninja")));
-  file_util::CreateDirectory(ninja_file.DirName());
+  base::CreateDirectory(ninja_file.DirName());
 
   std::ofstream file;
   file.open(FilePathToUTF8(ninja_file).c_str(),
             std::ios_base::out | std::ios_base::binary);
   if (file.fail())
     return false;
 
   std::ofstream depfile;
   depfile.open((FilePathToUTF8(ninja_file) + ".d").c_str(),
                std::ios_base::out | std::ios_base::binary);
@@ skipping 79 matching lines @@
       all_rules.append(" $\n    ");
     all_rules.append(target_file.value());
   }
 
   if (!all_rules.empty()) {
     out_ << "\nbuild all: phony " << all_rules << std::endl;
     out_ << "default all" << std::endl;
   }
 }