Various tweaks were made in Ibe212721807d3698dc45ef46b2dbde15ca9d2f70
to get the browser tests to pass. Many of them were unnecessary.
Change-Id: I47ac37512da38a33f4b3b919cc412b79231b0324
Instead load it via mw.loader.using
We retain the module name ext.popups as this will be present
in cached HTML, however now it will load the bulk of the code
inside ext.popups.main
Bug: T176211
Change-Id: Ibe212721807d3698dc45ef46b2dbde15ca9d2f70