mac: Turn on -Wunused-functions.

tools/gn/target.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/target.h"
 
 #include "base/bind.h"
 #include "tools/gn/config_values_extractors.h"
 #include "tools/gn/scheduler.h"
 
 namespace {
 
 typedef std::set<const Config*> ConfigSet;
 
-void TargetResolvedThunk(const base::Callback<void(const Target*)>& cb,
-                         const Target* t) {
-  cb.Run(t);
-}
-
 // Merges the dependent configs from the given target to the given config list.
 // The unique_configs list is used for de-duping so values already added will
 // not be added again.
 void MergeDirectDependentConfigsFrom(const Target* from_target,
                                      ConfigSet* unique_configs,
                                      LabelConfigVector* dest) {
   const LabelConfigVector& direct = from_target->direct_dependent_configs();
   for (size_t i = 0; i < direct.size(); i++) {
     if (unique_configs->find(direct[i].ptr) == unique_configs->end()) {
       unique_configs->insert(direct[i].ptr);
@@ skipping 163 matching lines @@
     // don't need to bother copying to our configs, only forwarding.
     DCHECK(std::find_if(deps_.begin(), deps_.end(),
                         LabelPtrPtrEquals<Target>(from_target)) !=
            deps_.end());
     direct_dependent_configs_.insert(
         direct_dependent_configs_.end(),
         from_target->direct_dependent_configs().begin(),
         from_target->direct_dependent_configs().end());
   }
 }