[automerger skipped] Merge "Remove obsolete zlib headers." am: cb5eb1f0b4 am: 8a51def067 -s ours am: 1bef7489e6 -s ours am: 9f69748ba7 -s ours am: c4c73134ef -s ours

am skip reason: Change-Id I320a6be58e1cb6f82f66d3931a7f55ec6de64605 with SHA-1 86244f380c is in history

Change-Id: I12f0c48b0b5874884d6a92ba58a9afb1d948fcc1