Remove unused resources

After deleting these files - mostly automated by Android Studio -
our final apk size went from 43MB to 37MB.

Test: make
Test: manual
Test: presubmit/integration tests
Fixes: 204361342
Change-Id: I7f76ca4249431fb226972ed48cc1a4a10328a556
Merged-In: I7f76ca4249431fb226972ed48cc1a4a10328a556