Revert "[CodeReview] Add prefix because message key is used by core now"

Was already removed from the extension per I0db5c6919da4e309f4433b9d0d49bce8bf3c6fc8

This reverts commit e365c9f5a086a8a0692b98719a0bac67b49d07fd.

Change-Id: I61ee910a806f2a69e6bc5b6cb81a9a7333669b0f
Merge "Revert "[CodeReview] Add prefix because message key is used by core now""