WONTFIX because Sebastian says that Fenix won't need this cookie API. Fenix 1.0 will integrate with the Android download manager, but without user cookies. After 1.0, Fenix can use the streaming download API (bug 1522705) to create its own download manager.
Bug 1476364 Comment 3 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
WONTFIX because Sebastian says that Fenix won't need this cookie API. Fenix MVP will integrate with the Android download manager, but without user cookies. After MVP, Fenix can use the streaming download API (bug 1522705) to create its own download manager.