[NaCl SDK] nacl_io: Always create directory node in http filesystem root.

native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.cc

Index: native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.cc b/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.cc
index b41cefbda0ea5df37b59275e2b96e18f57538eaa..e0b5cb95482917d49f4db0c6bfc857d3af397981 100644
--- a/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.cc
@@ -232,10 +232,8 @@ HttpFsNode::HttpFsNode(Filesystem* filesystem,
       buffer_len_(0),
       cache_content_(cache_content),
       has_cached_size_(false) {
-}
-
-void HttpFsNode::SetMode(int mode) {
-  stat_.st_mode = mode;
+  // http nodes are read-only by default
+  SetMode(S_IRALL);
 }
 
 Error HttpFsNode::GetStat_Locked(struct stat* stat) {
@@ -297,7 +295,7 @@ Error HttpFsNode::GetStat_Locked(struct stat* stat) {
     stat_.st_mtime = 0;
     stat_.st_ctime = 0;
 
-    stat_.st_mode |= S_IFREG;
+    SetType(S_IFREG);
   }
 
   // Fill the stat structure if provided