Made setting lowbox token a warning.

sandbox/win/sandbox_poc/main_ui_window.cc

Index: sandbox/win/sandbox_poc/main_ui_window.cc
diff --git a/sandbox/win/sandbox_poc/main_ui_window.cc b/sandbox/win/sandbox_poc/main_ui_window.cc
index c000ce13d006882ad38f84763d1cfd7a36a63d36..a8f1e593b9eb2f1fd17edb69dd050908f231a63a 100644
--- a/sandbox/win/sandbox_poc/main_ui_window.cc
+++ b/sandbox/win/sandbox_poc/main_ui_window.cc
@@ -513,9 +513,9 @@ bool MainUIWindow::SpawnTarget() {
   policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES,
                   sandbox::TargetPolicy::FILES_ALLOW_ANY, dll_path_.c_str());
 
-  sandbox::ResultCode result = broker_->SpawnTarget(spawn_target_.c_str(),
-                                                    arguments, policy,
-                                                    &target_);
+  sandbox::ResultCode warning_result = sandbox::SBOX_ALL_OK;
+  sandbox::ResultCode result = broker_->SpawnTarget(
+      spawn_target_.c_str(), arguments, policy, &warning_result, &target_);
 
   policy->Release();
   policy = NULL;