Enable check for DEP / NX page protection

src/trusted/service_runtime/web_worker_stub.c

Index: src/trusted/service_runtime/web_worker_stub.c
===================================================================
--- src/trusted/service_runtime/web_worker_stub.c	(revision 3470)
+++ src/trusted/service_runtime/web_worker_stub.c	(working copy)
@@ -27,6 +27,7 @@
 #include "native_client/src/shared/srpc/nacl_srpc.h"
 
 #include "native_client/src/trusted/desc/nacl_desc_imc.h"
+#include "native_client/src/trusted/platform_qualify/nacl_dep_qualify.h"
 #include "native_client/src/trusted/platform_qualify/nacl_os_qualify.h"
 
 #include "native_client/src/trusted/service_runtime/nacl_globals.h"
@@ -142,6 +143,12 @@
     goto done;
   }
   /*
+   * Ensure this platform has Data Execution Prevention enabled.
+   */
+  if (!NaClCheckDEP()) {
+    goto done;
+  }
+  /*
    * Load the NaCl module from the memory file.
    */
   if (LOAD_OK != NaClAppLoadFile((struct Gio *) &gf,