NaCl: Simpler validation for main nexe.

components/nacl/loader/nonsfi/nonsfi_listener.cc

Index: components/nacl/loader/nonsfi/nonsfi_listener.cc
diff --git a/components/nacl/loader/nonsfi/nonsfi_listener.cc b/components/nacl/loader/nonsfi/nonsfi_listener.cc
index 9acb1a4f4d188005850e03ad88647db133453049..09f30b28f7dfa982294b7c96eb30271e3d653459 100644
--- a/components/nacl/loader/nonsfi/nonsfi_listener.cc
+++ b/components/nacl/loader/nonsfi/nonsfi_listener.cc
@@ -154,8 +154,8 @@ void NonSfiListener::OnStart(const nacl::NaClStartParams& params) {
   CHECK(params.process_type == kNativeNaClProcessType);
 
   CHECK(params.nexe_file != IPC::InvalidPlatformFileForTransit());
-  CHECK(params.nexe_token_lo == 0);
-  CHECK(params.nexe_token_hi == 0);
+  CHECK(params.nexe_file_path_metadata.empty());
+
   MainStart(IPC::PlatformFileForTransitToPlatformFile(params.nexe_file));
 }