Remove third_party/zlib from DEPS
Remove third_party/zlib from DEPS

Nothing is using third_party/zlib.
Remove it from DEPS so we can remove it from the repository altogether.

BUG= none
TEST= trybots with --clobber

R=bradnelson@google.com

Review URL: http://codereview.chromium.org/8340010

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7065 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client