Remove content, docShell and chromeEventHandler attribute from base Domain class
as these fields only work for domains implemented in the content process and
attached to a browsing context/document.
For "global" domains like Target or Browser, that are not bound to any document,
these properties won't work.
Depends on D22687
Differential Revision: https://phabricator.services.mozilla.com/D22688
--HG--
rename : remote/domains/Domain.jsm => remote/domains/ContentProcessDomain.jsm
extra : moz-landing-system : lando
Alexandre Poirot