Update stale comment.

NOTRY=true
R=erg@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/138343002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245165 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245165