sync: Per-type update application

sync/engine/update_applicator.h

Index: sync/engine/update_applicator.h
diff --git a/sync/engine/update_applicator.h b/sync/engine/update_applicator.h
index b04325cc22127db92fa5886a1f62e95375825e8d..ff8fa15716385bfc2c6d308c6c9455bb21af25f6 100644
--- a/sync/engine/update_applicator.h
+++ b/sync/engine/update_applicator.h
@@ -35,9 +35,7 @@ class Cryptographer;
 
 class UpdateApplicator {
  public:
-  UpdateApplicator(Cryptographer* cryptographer,
-                   const ModelSafeRoutingInfo& routes,
-                   ModelSafeGroup group_filter);
+  UpdateApplicator(Cryptographer* cryptographer);
   ~UpdateApplicator();
 
   // Attempt to apply the specified updates.
@@ -67,10 +65,6 @@ class UpdateApplicator {
   // Used to decrypt sensitive sync nodes.
   Cryptographer* cryptographer_;
 
-  ModelSafeGroup group_filter_;
-
-  const ModelSafeRoutingInfo routing_info_;
-
   DISALLOW_COPY_AND_ASSIGN(UpdateApplicator);
 
   int updates_applied_;