Make the ZygoteHooks API more consistent

Make the ZygoteHooks API more consistent by making the API
entirely "static".

Bug: 111742291
Test: build / boot / treehugger
Merged-In: Ide38a9640a4d9f7a7621b8405a9732573f7420cf
Change-Id: Ide38a9640a4d9f7a7621b8405a9732573f7420cf
2 files changed