Cleanup: Use base/files/file_util.h instead of base/file_util.h in [r-t]*/

tools/gn/ninja_toolchain_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_toolchain_writer.h"
 
 #include <fstream>
 
-#include "base/file_util.h"
+#include "base/files/file_util.h"
 #include "base/strings/stringize_macros.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/ninja_utils.h"
 #include "tools/gn/settings.h"
 #include "tools/gn/substitution_writer.h"
 #include "tools/gn/target.h"
 #include "tools/gn/toolchain.h"
 #include "tools/gn/trace.h"
 
@@ skipping 108 matching lines @@
   // Write subninja commands for each generated target.
   for (size_t i = 0; i < targets_.size(); i++) {
     OutputFile ninja_file(targets_[i]->settings()->build_settings(),
                           GetNinjaFileForTarget(targets_[i]));
     out_ << "subninja ";
     path_output_.WriteFile(out_, ninja_file);
     out_ << std::endl;
   }
   out_ << std::endl;
 }