Update prediction settings text.

R=zork@chromium.org
BUG=340298

Review URL: https://codereview.chromium.org/186133002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254575 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254575