Revert 242913 "Make CookieMonster::Delegate top-level and remove..."

This is making fast/cookies/local-file-can-set-cookies.html fail:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fcookies%2Flocal-file-can-set-cookies.html

> Make CookieMonster::Delegate top-level and remove global CookieMonster::EnableFileScheme().
> 
> Relanding parts of https://chromiumcodereview.appspot.com/12546016
> 
> R=rsleevi@chromium.org
> TBR=jam
> BUG=159193,331424
> 
> Review URL: https://codereview.chromium.org/93593005

TBR=ajwong@chromium.org

Review URL: https://codereview.chromium.org/124093004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242920 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242920