GN: Move towards only using / on Windows

tools/gn/ninja_target_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_target_writer.h"
 
 #include <fstream>
 #include <sstream>
 
 #include "base/file_util.h"
 #include "tools/gn/err.h"
 #include "tools/gn/file_template.h"
 #include "tools/gn/ninja_action_target_writer.h"
 #include "tools/gn/ninja_binary_target_writer.h"
 #include "tools/gn/ninja_copy_target_writer.h"
 #include "tools/gn/ninja_group_target_writer.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/string_utils.h"
 #include "tools/gn/target.h"
 #include "tools/gn/trace.h"
 
 NinjaTargetWriter::NinjaTargetWriter(const Target* target,
                                      const Toolchain* toolchain,
                                      std::ostream& out)
     : settings_(target->settings()),
       target_(target),
       toolchain_(toolchain),
       out_(out),
-      path_output_(settings_->build_settings()->build_dir(),
-                   ESCAPE_NINJA, true),
-      helper_(settings_->build_settings()) {
-}
+      path_output_(settings_->build_settings()->build_dir(), ESCAPE_NINJA),
+      helper_(settings_->build_settings()) {}
 
 NinjaTargetWriter::~NinjaTargetWriter() {
 }
 
 // static
 void NinjaTargetWriter::RunAndWriteFile(const Target* target,
                                         const Toolchain* toolchain) {
   const Settings* settings = target->settings();
   NinjaHelper helper(settings->build_settings());
 
@@ skipping 71 matching lines @@
   const Target::FileList& outputs = target_->action_values().outputs();
   std::vector<std::string> output_template_args;
   for (size_t i = 0; i < outputs.size(); i++) {
     // All outputs should be in the output dir.
     output_template_args.push_back(
         RemovePrefix(outputs[i].value(),
                      settings_->build_settings()->build_dir().value()));
   }
   return FileTemplate(output_template_args);
 }