Revert "Merge pull request #8000 from mozsquib/dialer-lazy-load-fb"

This reverts commit fff77b1a7083d32b965d2bdb3ff1c4c5745228c5, reversing
changes made to 6ff9d32a37fccf737e5a1b46ef007ede4f43ad9d.
Merge pull request #8100 from etiennesegonzac/836363-backout

Revert "Merge pull request #8000 from mozsquib/dialer-lazy-load-fb"