Remove records for preview API levels.
Tracking the unfinalized API levels is causing more harm than good.
It's a major source of merge conflicts and the codenames themselves
are subject to change. It's also a pretty slow extra step for API
authors.
We can bring this back if we ever manage to get all the API surfaces
onto STG, because then we could use the STG files for signaling API
review instead of the *.map.txt filter, but since the others currently
don't use STG and don't track preview API, we can't do that today.
Bug: None
Test: treehugger
Merged-In: I790aad5e49b231d329cfa2e93c31ffcca69a25cc
Change-Id: I28160c53775a2f6ba967af139611fcda554f1814
355 files changed
