Add new schemes to content utils

According to latest content handler spec, new schemes are added to it. Those are geo, magnet, sip, ssh and xmpp.

Spec: http://www.w3.org/html/wg/drafts/html/master/webappapis.html#custom-handlers

WebKit merge from http://trac.webkit.org/changeset/152162.

TESTS=fast/dom/register-protocol-handler.html
      fast/dom/unregister-protocol-handler.html

BUG=

Review URL: https://chromiumcodereview.appspot.com/18234004

git-svn-id: svn://svn.chromium.org/blink/trunk@153303 bbb929c8-8fbe-4397-9dbb-9b2b20218538