Remove thread refcount and remove NaClAppDtor()

src/native_client/src/trusted/service_runtime/sel_addrspace.c

Index: src/native_client/src/trusted/service_runtime/sel_addrspace.c
diff --git a/src/native_client/src/trusted/service_runtime/sel_addrspace.c b/src/native_client/src/trusted/service_runtime/sel_addrspace.c
index 00316896bf6e409ef1ce21cdc6747adead25fcaf..18daa8bca5ca89325feb718365d453db4414ca29 100644
--- a/src/native_client/src/trusted/service_runtime/sel_addrspace.c
+++ b/src/native_client/src/trusted/service_runtime/sel_addrspace.c
@@ -35,7 +35,6 @@ NaClErrorCode NaClAllocAddrSpace(struct NaClApp *nap) {
 
   nap->mem_start = (uintptr_t) mem;
   NaClLog(2, "allocated memory at 0x%08"NACL_PRIxPTR"\n", nap->mem_start);
-  nap->guard_pages_initialized = 1;
 
   hole_start = NaClRoundAllocPage(nap->data_end);