Delete @removed-at-birth Bubble APIs

These APIs never shipped in a final SDK, but were marked @removed
instead of actually removed (to maintain compatibility with DPs).

It's been a while, so just delete them now.
    added ag/10063045
    removed ag/10890452

Bug: 155877914
Test: m
Change-Id: Ie39290a5aefb69c0021dffd014b0f06eb1105ac0