Update nacl_helper-data expectations

Increase of about 2.5K. Confirmed with jln@ on #chromium that this is
reasonable from r239550.

Also, fix file mode opening in make_expectations.py so that
the script works on Windows and doesn't change every line.

R=vadimt@chromium.org, andrewhayden@chromium.org, jln@chromium.org

Review URL: https://codereview.chromium.org/110793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239579 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239579