[REFACTOR] Deletes unused classes.

Change-Id: Ib8ccc1d2bbb6413a389ab93b643e6287986c1be0
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1964
Tested-by: Jenkins CI
Reviewed-by: Holger Schmeisky <google@schmeisky.com>