sync: Remove UpdateProgress and related code

sync/engine/apply_updates_command.cc

Index: sync/engine/apply_updates_command.cc
diff --git a/sync/engine/apply_updates_command.cc b/sync/engine/apply_updates_command.cc
index e43f0710b944c04068b36e27770107b38aaba8e0..bff83f2260a345a79349c1d7b87cbe2c1ed4a9f5 100644
--- a/sync/engine/apply_updates_command.cc
+++ b/sync/engine/apply_updates_command.cc
@@ -71,9 +71,6 @@ SyncerError ApplyUpdatesCommand::ModelChangingExecuteImpl(
       session->status_controller().group_restriction());
   applicator.AttemptApplications(&trans, handles,
                                  session->mutable_status_controller());
-  applicator.SaveProgressIntoSessionState(
-      session->mutable_status_controller()->mutable_simple_conflict_ids(),
-      session->mutable_status_controller()->mutable_update_progress());
 
   // This might be the first time we've fully completed a sync cycle, for
   // some subset of the currently synced datatypes.