Reduce usage of ProjectControl

Reduce the usage of ProjectControl by replacing it with ProjectState and
CurrentUser where it was just used as a container for these.

Eventually, {Ref,Change,Project}Control should be package-private. This
commit is an incremental step towards that goal.

Change-Id: I204d7cae3816e81a7859672a6ac3b5d5273997fa

gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/project/ProjectAccessHandler.java

@@ -147,7 +147,8 @@ public abstract class ProjectAccessHandler<T> extends Handler<T> {
           setParent
               .get()
               .validateParentUpdate(
-                  projectControl,
+                  projectControl.getProject().getNameKey(),
+                  projectControl.getUser().asIdentifiedUser(),
                   MoreObjects.firstNonNull(parentProjectName, allProjects).get(),
                   checkIfOwner);
         } catch (AuthException e) {