Remove apache-http host build.

Was probably used by the dalvik host build once upon a time, but
isn't referenced any longer.

This is in preparation for changes that make this library depend
on the frameworks so that it isn't treated specially.

bug: 18027885
Change-Id: Iccf2ea4441eadea3400445d0542130c7362fd331
Merge "Remove apache-http host build."