Remove thread refcount and remove NaClAppDtor()

src/native_client/src/trusted/service_runtime/nacl_app_thread.c

Index: src/native_client/src/trusted/service_runtime/nacl_app_thread.c
diff --git a/src/native_client/src/trusted/service_runtime/nacl_app_thread.c b/src/native_client/src/trusted/service_runtime/nacl_app_thread.c
index b0ca4f45cc222667e6a981aab46ce52c4156b5e7..e105a79c904b2110700c2cf70774367b6c224844 100644
--- a/src/native_client/src/trusted/service_runtime/nacl_app_thread.c
+++ b/src/native_client/src/trusted/service_runtime/nacl_app_thread.c
@@ -88,7 +88,6 @@ int NaClAppThreadCtor(struct NaClAppThread  *natp,
   }
 
   natp->is_privileged = is_privileged;
-  natp->refcount = 1;
 
   if (!NaClClosureResultCtor(&natp->result)) {
     goto cleanup_cv;
@@ -208,35 +207,3 @@ int NaClAppThreadAllocSegCtor(struct NaClAppThread  *natp,
                            tls_idx,
                            sys_tdb_base);
 }
-
-
-int NaClAppThreadIncRef(struct NaClAppThread *natp) {
-  int refcount;
-
-  NaClXMutexLock(&natp->mu);
-  if (natp->refcount == 0) {
-    NaClLog(LOG_FATAL, "NaClAppThreadIncRef: count was already 0!\n");
-  }
-  if (++natp->refcount == 0) {
-    NaClLog(LOG_FATAL, "NaClAppThreadIncRef: refcount overflow\n");
-  }
-  refcount = natp->refcount;
-  NaClXMutexUnlock(&natp->mu);
-
-  return refcount;
-}
-
-
-int NaClAppThreadDecRef(struct NaClAppThread *natp) {
-  int refcount;
-
-  NaClXMutexLock(&natp->mu);
-  refcount = --natp->refcount;
-  NaClXMutexUnlock(&natp->mu);
-
-  if (0 == refcount) {
-    NaClAppThreadDtor(natp);
-    free(natp);
-  }
-  return refcount;
-}