Remove thread refcount and remove NaClAppDtor()

src/native_client/src/trusted/service_runtime/arch/arm/sel_addrspace_arm.c

Index: src/native_client/src/trusted/service_runtime/arch/arm/sel_addrspace_arm.c
diff --git a/src/native_client/src/trusted/service_runtime/arch/arm/sel_addrspace_arm.c b/src/native_client/src/trusted/service_runtime/arch/arm/sel_addrspace_arm.c
index 7531edff18dba43abb280de440cbf330dd7d30fb..7283cd604598ce31c0daf3e8b4f7f7e3b38e426f 100644
--- a/src/native_client/src/trusted/service_runtime/arch/arm/sel_addrspace_arm.c
+++ b/src/native_client/src/trusted/service_runtime/arch/arm/sel_addrspace_arm.c
@@ -110,18 +110,3 @@ NaClErrorCode NaClMprotectGuards(struct NaClApp *nap) {
    */
   return LOAD_OK;
 }
-
-void NaClTeardownMprotectGuards(struct NaClApp *nap) {
-  void *guard_base = (void *) (((uintptr_t) 1) << nap->addr_bits);
-
-  if (!nap->guard_pages_initialized) {
-    NaClLog(4, "No guard pages to tear down.\n");
-    return;
-  }
-  NaClLog(4, "NaClTeardownMprotectGuards: %"NACL_PRIxPTR", %"NACL_PRIxS"\n",
-          (uintptr_t) guard_base,
-          (size_t) POST_ADDR_SPACE_GUARD_SIZE);
-  NaCl_page_free(guard_base, POST_ADDR_SPACE_GUARD_SIZE);
-
-  NaClLog(4, "NaClTeardownMprotectGuards: done\n");
-}