Remove is_win/OS_WIN checks in shell code

shell/child_process_host.cc

Index: shell/child_process_host.cc
diff --git a/shell/child_process_host.cc b/shell/child_process_host.cc
index 6d8cf8ae75f5034a8f3822cb5ea79e60737b5e45..2085be4a9d8472fc389f30fd9520495a6df72c3c 100644
--- a/shell/child_process_host.cc
+++ b/shell/child_process_host.cc
@@ -75,12 +75,7 @@ bool ChildProcessHost::DoLaunch() {
       &child_command_line, &handle_passing_info);
 
   base::LaunchOptions options;
-#if defined(OS_WIN)
-  options.start_hidden = true;
-  options.handles_to_inherit = &handle_passing_info;
-#elif defined(OS_POSIX)
   options.fds_to_remap = &handle_passing_info;
-#endif
   child_process_ = base::LaunchProcess(child_command_line, options);
   if (!child_process_.IsValid())
     return false;