Update HttpResponseCache to use the new cache API.

The new API was introduced in

https://android-review.googlesource.com/#/c/59985/

Change-Id: Ie64de7fc64b818bebf1077dff407813865769387
Merge "Update HttpResponseCache to use the new cache API."
Merge https://android.googlesource.com/platform/frameworks/base into jb-devel