Unbreak unregisterNetworkCallback.

http://ag/1194313 broke unregisterNetworkCallback because the
system does not parcel the type of the request back to the app.
So when the app calls unregisterNetworkCallback, the
NetworkRequest that's passed in does not have a type and thus
doesn't match the request in mNetworkRequests.

Fix this by parceling over the type as well.

This was not caught by the unit test because the unit test all
runs in the same process with no parceling.

Bug: 23113288
Change-Id: I58b2ed651b9bf5cbdcca5b25c3ca24db53cffdf1