Unhide DelegateLastClassLoader.

Tracks libcore change 0209ec7e3c608acc3f1b63413686a3391551dcd5.

Test: make update-api; make checkapi

Bug: 37966546
Change-Id: Idfc22eff5d8bb82690f99a73765dc58dc6fd99fe
(cherry picked from commit be0fc6e48ee0ef44472edcca09b472fb0c497eed)
3 files changed