Improve process launch handle sharing API.

net/test/spawned_test_server/local_test_server_posix.cc

 // Copyright (c) 2012 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 "net/test/spawned_test_server/local_test_server.h"
 
 #include <poll.h>
 
 #include <vector>
 
@@ skipping 108 matching lines @@
 
   int pipefd[2];
   if (pipe(pipefd) != 0) {
     PLOG(ERROR) << "Could not create pipe.";
     return false;
   }
 
   // Save the read half. The write half is sent to the child.
   child_fd_.reset(pipefd[0]);
   base::ScopedFD write_closer(pipefd[1]);
-  base::FileHandleMappingVector map_write_fd;
-  map_write_fd.push_back(std::make_pair(pipefd[1], pipefd[1]));
 
   python_command.AppendArg("--startup-pipe=" + base::IntToString(pipefd[1]));
 
   // Try to kill any orphaned testserver processes that may be running.
   OrphanedTestServerFilter filter(testserver_path.value(),
                                   base::UintToString(GetPort()));
   if (!base::KillProcesses("python", -1, &filter)) {
     LOG(WARNING) << "Failed to clean up older orphaned testserver instances.";
   }
 
   // Launch a new testserver process.
   base::LaunchOptions options;
-
-  options.fds_to_remap = &map_write_fd;
+  options.fds_to_remap.push_back(std::make_pair(pipefd[1], pipefd[1]));
   process_ = base::LaunchProcess(python_command, options);
   if (!process_.IsValid()) {
     LOG(ERROR) << "Failed to launch " << python_command.GetCommandLineString();
     return false;
   }
 
   return true;
 }
 
 bool LocalTestServer::WaitToStart() {
@@ skipping 18 matching lines @@
 
   if (!ParseServerData(server_data)) {
     LOG(ERROR) << "Could not parse server_data: " << server_data;
     return false;
   }
 
   return true;
 }
 
 }  // namespace net