[NaCl SDK] nacl_io: Fix utime() on directories.

native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc b/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
index 38c5070546306a4a8b9eeeeece60124adfc36ab8..70da25ce58fa96593570ca2e0f9f22c82df7f70a 100644
--- a/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
@@ -105,10 +105,6 @@ Error MemFs::OpenWithMode(const Path& path, int open_flags, mode_t mode,
   } else {
     // Opening an existing file.
 
-    // Directories can only be opened read-only.
-    if (node->IsaDir() && (open_flags & 3) != O_RDONLY)
-      return EISDIR;
-
     // If we were expected to create it exclusively, fail
     if (open_flags & O_EXCL)
       return EEXIST;