[Sync] Convert syncable/ directory to ModelEnumSet

chrome/browser/sync/engine/apply_updates_command.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/engine/apply_updates_command.h"
 
 #include "base/location.h"
 #include "chrome/browser/sync/engine/update_applicator.h"
 #include "chrome/browser/sync/sessions/sync_session.h"
 #include "chrome/browser/sync/syncable/directory_manager.h"
@@ skipping 75 matching lines @@
       session->status_controller().group_restriction());
   while (applicator.AttemptOneApplication(&trans)) {}
   applicator.SaveProgressIntoSessionState(
       session->mutable_status_controller()->mutable_conflict_progress(),
       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.
   const sessions::StatusController& status(session->status_controller());
   if (status.ServerSaysNothingMoreToDownload()) {
-    for (int i = syncable::FIRST_REAL_MODEL_TYPE;
-         i < syncable::MODEL_TYPE_COUNT; ++i) {
-      syncable::ModelType model_type = syncable::ModelTypeFromInt(i);
-      if (status.updates_request_types()[i]) {
-        // This gets persisted to the directory's backing store.
-        dir->set_initial_sync_ended_for_type(model_type, true);
-      }
+    for (syncable::ModelEnumSet::Iterator it =
+             status.updates_request_types().First(); it.Good(); it.Inc()) {
+      // This gets persisted to the directory's backing store.
+      dir->set_initial_sync_ended_for_type(it.Get(), true);
     }
   }
 }
 
 }  // namespace browser_sync