tools/gn: Change auto to not deduce raw pointers.

tools/gn/command_ls.cc

 // Copyright 2014 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 <algorithm>
 #include <set>
 
 #include "base/command_line.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/label_pattern.h"
@@ skipping 82 matching lines @@
                                      &target_matches, &config_matches,
                                      &toolchain_matches, &file_matches))
       return 1;
     matches.insert(matches.begin(),
                    target_matches.begin(), target_matches.end());
   } else if (all_toolchains) {
     // List all resolved targets.
     matches = setup->builder()->GetAllResolvedTargets();
   } else {
     // List all resolved targets in the default toolchain.
-    for (const auto& target : setup->builder()->GetAllResolvedTargets()) {
+    for (auto* target : setup->builder()->GetAllResolvedTargets()) {
       if (target->settings()->is_default())
         matches.push_back(target);
     }
   }
   FilterAndPrintTargets(false, &matches);
   return 0;
 }
 
 }  // namespace commands