GN: toolchain threading cleanup

tools/gn/function_exec_script.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 "base/command_line.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 283 matching lines @@
   SourceFile script_source =
       cur_dir.ResolveRelativeFile(args[0].string_value());
   base::FilePath script_path = build_settings->GetFullPath(script_source);
   if (!build_settings->secondary_source_path().empty() &&
       !base::PathExists(script_path)) {
     // Fall back to secondary source root when the file doesn't exist.
     script_path = build_settings->GetFullPathSecondary(script_source);
   }
 
   ScopedTrace trace(TraceItem::TRACE_SCRIPT_EXECUTE, script_source.value());
-  trace.SetToolchain(settings->toolchain()->label());
+  trace.SetToolchain(settings->toolchain_label());
 
   // Add all dependencies of this script, including the script itself, to the
   // build deps.
   g_scheduler->AddGenDependency(script_path);
   if (args.size() == 4) {
     const Value& deps_value = args[3];
     if (!deps_value.VerifyTypeIs(Value::LIST, err))
       return Value();
 
     for (size_t i = 0; i < deps_value.list_value().size(); i++) {
@@ skipping 73 matching lines @@
       msg += ".";
     *err = Err(function->function(), "Script returned non-zero exit code.",
                msg);
     return Value();
   }
 
   return ConvertInputToValue(output, function, args[2], err);
 }
 
 }  // namespace functions