Revert "Bug 1044231 - Xfail test_everything_me_launch_link.py a=testonly r=me"

This reverts commit e95ac19a89b858528031a90d688bf39ff7dcf0a3.
Revert "Revert "Bug 1042744 - Add a container around app iframes and some chrome UI. r=alive" under suspicion of breaking JB emulator builds"

This reverts commit ebb824c7e4c1be271d68c773ac75ae0cfb79238d.
Merge pull request #22200 from vingtetun/revert.revert.browser-container

Revert "Revert "Bug 1042744 - Add a container around app iframes and som...