Remove ResponseCache from apache-http

It is not clear why ResponseCache was included: it doesn't
relate to apache-http. Its inclusion causes
obscure problems related to switching over to building
against "core platform API" stubs so it is being removed
here.

Bug: 117169648
Bug: 113148576
Test: build
Change-Id: If2ce6d49b59207254e8217a5d8bfb393bd2e8c92