Improve process launch handle sharing API.

chrome/utility/image_writer/image_writer_mac.cc

Index: chrome/utility/image_writer/image_writer_mac.cc
diff --git a/chrome/utility/image_writer/image_writer_mac.cc b/chrome/utility/image_writer/image_writer_mac.cc
index a2c111c50d1e6b6c83e94f928018dfc042619955..bd3bf4ec479a18b7a6b604912dfd1130ba0f326a 100644
--- a/chrome/utility/image_writer/image_writer_mac.cc
+++ b/chrome/utility/image_writer/image_writer_mac.cc
@@ -75,7 +75,7 @@ void ImageWriter::UnmountVolumes(const base::Closure& continuation) {
 }
 
 bool ImageWriter::OpenDevice() {
-  base::LaunchOptions options = base::LaunchOptions();
+  base::LaunchOptions options;
   options.wait = false;
 
   // Create a socket pair for communication.
@@ -89,9 +89,8 @@ bool ImageWriter::OpenDevice() {
   base::ScopedFD child_socket(sockets[1]);
 
   // Map the client socket to the client's STDOUT.
-  base::FileHandleMappingVector fd_map;
-  fd_map.push_back(std::pair<int, int>(child_socket.get(), STDOUT_FILENO));
-  options.fds_to_remap = &fd_map;
+  options.fds_to_remap.push_back(
+      std::pair<int, int>(child_socket.get(), STDOUT_FILENO));
 
   // Find the file path to open.
   base::FilePath real_device_path;