Fix a lock level violation with background compaction enabled.
Fix a lock level violation with background compaction enabled.

Bug: 14840305
Change-Id: I19f3d26af0c4f9c5a2843e0d95c8c10391cc38b1

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst