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

tools/gn/header_checker.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 "tools/gn/header_checker.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 111 matching lines @@
   return a->label().dir() == b->label().dir() &&
          a->label().name() == b->label().name();
 }
 
 }  // namespace
 
 HeaderChecker::HeaderChecker(const BuildSettings* build_settings,
                              const std::vector<const Target*>& targets)
     : main_loop_(base::MessageLoop::current()),
       build_settings_(build_settings) {
-  for (const auto& target : targets)
+  for (auto* target : targets)
     AddTargetToFileMap(target, &file_map_);
 }
 
 HeaderChecker::~HeaderChecker() {
 }
 
 bool HeaderChecker::Run(const std::vector<const Target*>& to_check,
                         bool force_check,
                         std::vector<Err>* errors) {
   FileMap files_to_check;
-  for (const auto& check : to_check)
+  for (auto* check : to_check)
     AddTargetToFileMap(check, &files_to_check);
   RunCheckOverFiles(files_to_check, force_check);
 
   if (errors_.empty())
     return true;
   *errors = errors_;
   return false;
 }
 
 void HeaderChecker::RunCheckOverFiles(const FileMap& files, bool force_check) {
@@ skipping 406 matching lines @@
       }
     }
   }
 
   // Only display toolchains on labels if they don't all match.
   bool include_toolchain = !targets_with_other_toolchains.empty();
 
   std::string msg = "It is not in any dependency of\n  " +
       from_target->label().GetUserVisibleName(include_toolchain);
   msg += "\nThe include file is in the target(s):\n";
-  for (const auto& target : targets_with_matching_toolchains)
+  for (auto* target : targets_with_matching_toolchains)
     msg += "  " + target->label().GetUserVisibleName(include_toolchain) + "\n";
-  for (const auto& target : targets_with_other_toolchains)
+  for (auto* target : targets_with_other_toolchains)
     msg += "  " + target->label().GetUserVisibleName(include_toolchain) + "\n";
   if (targets_with_other_toolchains.size() +
       targets_with_matching_toolchains.size() > 1)
     msg += "at least one of ";
   msg += "which should somehow be reachable.";
 
   // Danger: must call CreatePersistentRange to put in Err.
   return Err(CreatePersistentRange(source_file, range),
              "Include not allowed.", msg);
 }