Redo of commit:

commit eca10d45897a114aa17ca818d1998d317d08b23b
Author: John Heywood <vbc863@motorolasolutions.com>
Date:   Wed Apr 3 13:50:54 2013 +0100

    WM: Correct naming of (De)RegisterForBrowserMessage

    Changed RegisterForMessageCallback to RegisterForBrowserMessage and
    DeRegisterForMessageCallback to DeRegisterForBrowserMessage