"up-to-date" should only use hyphens when used as compound modifier of a noun

tools/gn/ninja_action_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_action_target_writer.h"
 
 #include <stddef.h>
 
 #include "base/strings/string_util.h"
 #include "tools/gn/deps_iterator.h"
@@ skipping 148 matching lines @@
 
   const Target::FileList& sources = target_->sources();
   for (size_t i = 0; i < sources.size(); i++) {
     out_ << "build";
     WriteOutputFilesForBuildLine(sources[i], output_files);
 
     out_ << ": " << custom_rule_name << " ";
     path_output_.WriteFile(out_, sources[i]);
     if (!input_dep.value().empty()) {
       // Using "|" for the dependencies forces all implicit dependencies to be
-      // fully up-to-date before running the action, and will re-run this
+      // fully up to date before running the action, and will re-run this
       // action if any input dependencies change. This is important because
       // this action may consume the outputs of previous steps.
       out_ << " | ";
       path_output_.WriteFile(out_, input_dep);
     }
     out_ << std::endl;
 
     // Response files require a unique name be defined.
     if (target_->action_values().uses_rsp_file())
       out_ << "  unique_name = " << i << std::endl;
@@ skipping 32 matching lines @@
     out_ << " ";
     path_output_.WriteFile(out_, (*output_files)[i]);
   }
 }
 
 void NinjaActionTargetWriter::WriteDepfile(const SourceFile& source) {
   path_output_.WriteFile(out_,
       SubstitutionWriter::ApplyPatternToSourceAsOutputFile(
           settings_, target_->action_values().depfile(), source));
 }