peerd: Remove ManagerDBusProxy

With this clever C++ type to DBus handler framework, we don't need
gratuitious amounts of parsing logic, or a place to put it.

BUG=chromium:403582
TEST=`FEATURES=test emerge-gizmo peerd`

Change-Id: I45c493d2d61d7b2484166f24d02e099cb2d5dcd9
Reviewed-on: https://chromium-review.googlesource.com/214242
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
6 files changed