Add the new version for the POSIX-specific version of LaunchProcess.

base/process/launch_posix.cc

Index: base/process/launch_posix.cc
diff --git a/base/process/launch_posix.cc b/base/process/launch_posix.cc
index 3322d265785246e8076e8ddd9591701f57db7f5c..c60cfdc9fc430a181f09d904a20b99b70dbe4740 100644
--- a/base/process/launch_posix.cc
+++ b/base/process/launch_posix.cc
@@ -473,6 +473,15 @@ bool LaunchProcess(const std::vector<std::string>& argv,
   return true;
 }
 
+Process LaunchProcess(const std::vector<std::string>& argv,
+                      const LaunchOptions& options) {
+  ProcessHandle process_handle;
+  if (LaunchProcess(argv, options, &process_handle))
+    return Process(process_handle);
+
+  return Process();
+}
+
 
 bool LaunchProcess(const CommandLine& cmdline,
                    const LaunchOptions& options,