Remove file_util debugging cruft from crbug.com/108724

BUG=108724
TEST=NONE

Review URL: https://codereview.chromium.org/24235010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227866 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227866