Use region provided by zamboni in index.html if present (bug 1082855)

https://bugzilla.mozilla.org/show_bug.cgi?id=1082855

If the user is logged out this avoids the call to consumer_info entirely for the iframed app / website. It does nothing for the true packaged app, since it has its own static index.html.
declare and instantiate on the same line below?