Improve process launch handle sharing API.

chrome/test/chromedriver/chrome_launcher.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 "chrome/test/chromedriver/chrome_launcher.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 341 matching lines @@
 #endif
 
 #if !defined(OS_WIN)
   if (!capabilities.log_path.empty())
     options.environ["CHROME_LOG_FILE"] = capabilities.log_path;
   if (capabilities.detach)
     options.new_process_group = true;
 #endif
 
 #if defined(OS_POSIX)
-  base::FileHandleMappingVector no_stderr;
   base::ScopedFD devnull;
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch("verbose")) {
     // Redirect stderr to /dev/null, so that Chrome log spew doesn't confuse
     // users.
     devnull.reset(HANDLE_EINTR(open("/dev/null", O_WRONLY)));
     if (!devnull.is_valid())
       return Status(kUnknownError, "couldn't open /dev/null");
-    no_stderr.push_back(std::make_pair(devnull.get(), STDERR_FILENO));
-    options.fds_to_remap = &no_stderr;
+    options.fds_to_remap.push_back(
+        std::make_pair(devnull.get(), STDERR_FILENO));
   }
 #elif defined(OS_WIN)
   if (!SwitchToUSKeyboardLayout())
     VLOG(0) << "Cannot switch to US keyboard layout - some keys may be "
         "interpreted incorrectly";
 #endif
 
 #if defined(OS_WIN)
   std::string command_string = base::WideToUTF8(command.GetCommandLineString());
 #else
@@ skipping 495 matching lines @@
   // Write empty "First Run" file, otherwise Chrome will wipe the default
   // profile that was written.
   if (base::WriteFile(
           user_data_dir.Append(chrome::kFirstRunSentinel), "", 0) != 0) {
     return Status(kUnknownError, "failed to write first run file");
   }
   return Status(kOk);
 }
 
 }  // namespace internal