GN: toolchain threading cleanup

tools/gn/functions.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/functions.h"
 
 #include <iostream>
 
 #include "base/strings/string_util.h"
 #include "tools/gn/config.h"
@@ skipping 116 matching lines @@
                            Err* err) {
   if (args.size() != 1) {
     *err = Err(function->function(), "Incorrect arguments.",
                "This function requires a single string argument.");
     return false;
   }
   return args[0].VerifyTypeIs(Value::STRING, err);
 }
 
 const Label& ToolchainLabelForScope(const Scope* scope) {
-  return scope->settings()->toolchain()->label();
+  return scope->settings()->toolchain_label();
 }
 
 Label MakeLabelForScope(const Scope* scope,
                         const FunctionCallNode* function,
                         const std::string& name) {
   const Label& toolchain_label = ToolchainLabelForScope(scope);
   return Label(scope->GetSourceDir(), name, toolchain_label.dir(),
                toolchain_label.name());
 }
 
@@ skipping 495 matching lines @@
     return found_function->second.executed_block_runner(
         function, args.list_value(), &block_scope, err);
   }
 
   // Otherwise it's a no-block function.
   return found_function->second.no_block_runner(scope, function,
                                                 args.list_value(), err);
 }
 
 }  // namespace functions