[Sync] Replace all instances of ModelTypeSet with ModelEnumSet

chrome/browser/sync/glue/session_model_associator.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/glue/session_model_associator.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 1229 matching lines @@
     const TabNavigation navigation = *i;
     sync_pb::TabNavigation* tab_navigation =
         session_tab->add_navigation();
     PopulateSessionSpecificsNavigation(&navigation, tab_navigation);
   }
 }
 
 bool SessionModelAssociator::CryptoReadyIfNecessary() {
   // We only access the cryptographer while holding a transaction.
   sync_api::ReadTransaction trans(FROM_HERE, sync_service_->GetUserShare());
-  syncable::ModelTypeSet encrypted_types;
-  encrypted_types = sync_api::GetEncryptedTypes(&trans);
-  return encrypted_types.count(SESSIONS) == 0 ||
+  const syncable::ModelEnumSet encrypted_types =
+      sync_api::GetEncryptedTypes(&trans);
+  return !encrypted_types.Has(SESSIONS) ||
          sync_service_->IsCryptographerReady(&trans);
 }
 
 }  // namespace browser_sync