Disable noisy printf in nss_util.cc

This is printed in every browser test, and just adds noise. Switch it
to VLOG(1) so it's available when wanted.

R=rsleevi@chromium.org
BUG=339891

Review URL: https://codereview.chromium.org/148483008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248290 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248290