Revert "Bug 957418 - Fix interapp communication API for Rocketbar"

This reverts commit 6e12bf5d7537e156e7acbee20e9936d9d4677b9a.
Bug 957418 - Fix interapp communication API for Rocketbar
Merge pull request #15132 from KevinGrandon/bug_957418_resolve_invalid_commit

Bug 957418 - Enable rocketbar development in browser