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

native_client_sdk/src/libraries/nacl_io/node.cc

Index: native_client_sdk/src/libraries/nacl_io/node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/node.cc b/native_client_sdk/src/libraries/nacl_io/node.cc
index 373f96656ec3e7bda14fb21ea56623c6099ecc67..a09770898c30ae8b835ab0d5c81230a86e2ff227 100644
--- a/native_client_sdk/src/libraries/nacl_io/node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/node.cc
@@ -199,6 +199,12 @@ void Node::SetType(int type) {
   stat_.st_mode |= type;
 }
 
+void Node::SetMode(int mode) {
+  assert((mode & S_IFMT) == 0);
+  stat_.st_mode &= S_IFMT;
+  stat_.st_mode |= mode;
+}
+
 bool Node::IsaDir() {
   return GetType() == S_IFDIR;
 }