[4.4] Upgrade InlineHistory extension

DO NOT COMMIT until Bugzilla has been upgraded to 4.4.

Upgrade InlineHistory extension to make it work with 4.4.
It's slightly messy upstream, for the records:
https://bugzilla.mozilla.org/show_bug.cgi?id=935513

Change-Id: If0a1c4f13f59eb34c23587c85d4e5eda9fd7dc09