Bug 926971 - Use wait_for_everything_me_loaded in e.me tests, r=zac

Note that I had to change the "type" that we are waiting for in the "Skyfall" test to `BrandInfo` from `Movies` as that has changed in the app. I wonder if that check is going to continue to be brittle and perhaps it should be changed to wait for something else? If so, that change could be added to this PR, or done in a separate bug/PR.