Fix GN hang spawning a process.

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 169 matching lines @@
 
         fd_shuffle1.push_back(
             base::InjectionArc(pipe_fd[1], STDOUT_FILENO, true));
         fd_shuffle1.push_back(
             base::InjectionArc(dev_null, STDERR_FILENO, true));
         fd_shuffle1.push_back(
             base::InjectionArc(dev_null, STDIN_FILENO, true));
         // Adding another element here? Remeber to increase the argument to
         // reserve(), above.
 
-        std::copy(fd_shuffle1.begin(), fd_shuffle1.end(),
-                  std::back_inserter(fd_shuffle2));
+        for (size_t i = 0; i < fd_shuffle1.size(); ++i)
+          fd_shuffle2.push_back(fd_shuffle1[i]);
 
         if (!ShuffleFileDescriptors(&fd_shuffle1))
           _exit(127);
 
         base::SetCurrentDirectory(startup_dir);
 
         // TODO(brettw) the base version GetAppOutput does a
         // CloseSuperfluousFds call here. Do we need this?
 
         for (size_t i = 0; i < argv.size(); i++)
@@ skipping 206 matching lines @@
                msg);
     return Value();
   }
 
   // Default to None value for the input conversion if unspecified.
   return ConvertInputToValue(scope->settings(), output, function,
                              args.size() >= 3 ? args[2] : Value(), err);
 }
 
 }  // namespace functions