Update the memory consumption values for DataOut.

Update the memory consumption values for DataOut.
I removed three 'dummy' integers in commit 95a5595 to silence warnings
about unused private members. Most C++ compilers use 4 bytes for an int
and 1 byte for an empty class, so the net result was a loss of 9 bytes
for DataOutInterface (inherited by DataOut). This commit updates the
expected memory usage values to match.