Improve GN handling of directory templates.

tools/gn/ninja_target_writer.cc

Index: tools/gn/ninja_target_writer.cc
diff --git a/tools/gn/ninja_target_writer.cc b/tools/gn/ninja_target_writer.cc
index df0412bcfab52174f3a35e69a8edae7064892e75..4003a3fdba80ce164f37cf1d6c925fa59e9b7f58 100644
--- a/tools/gn/ninja_target_writer.cc
+++ b/tools/gn/ninja_target_writer.cc
@@ -168,15 +168,3 @@ std::string NinjaTargetWriter::WriteInputDepsStampAndGetDep(
   out_ << "\n";
   return " | " + stamp_file_string;
 }
-
-FileTemplate NinjaTargetWriter::GetOutputTemplate() const {
-  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(target_->settings(), output_template_args);
-}