Fix handling of @removed APIs.

The @removed docs tag means that a particular API should be considered
as removed from the API surface area that it otherwise would have been
exposed through.

This set of CLs is fixing a bug where we @removed had been treated as
always removing from the public API.

Bug: 62341924
Test: make -j32 update-api
Change-Id: Iec3f32c6b791d63e63bbb3acd5500a84935c560f
1 file changed