Revert "Simplify [ReceivePack]MessageSender logic"

This reverts commit 7c4f0c3f30.

Reason for revert: Google uses a different MessageSender implementation
internally.

The rebased version of this revert keeps the cosmetic variable
renamings.

Change-Id: Ieda44268c38819dd887e9563effc794e278e6810

java/com/google/gerrit/acceptance/InProcessProtocol.java

@@ -331,7 +331,7 @@ class InProcessProtocol extends TestProtocol<Context> {
         }
 
         AsyncReceiveCommits arc =
-            factory.create(projectState, identifiedUser, db, ImmutableSetMultimap.of());
+            factory.create(projectState, identifiedUser, db, null, ImmutableSetMultimap.of());
         if (arc.canUpload() != Capable.OK) {
           throw new ServiceNotAuthorizedException();
         }