[not for review] sync: Don't use group_restriction from ApplyUpdatesCommand.

sync/engine/model_safe_worker.h

 // Copyright (c) 2012 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.
 
 #ifndef SYNC_ENGINE_MODEL_SAFE_WORKER_H_
 #define SYNC_ENGINE_MODEL_SAFE_WORKER_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 61 matching lines @@
 // Caller takes ownership of return value.
 base::DictionaryValue* ModelSafeRoutingInfoToValue(
     const ModelSafeRoutingInfo& routing_info);
 
 std::string ModelSafeRoutingInfoToString(
     const ModelSafeRoutingInfo& routing_info);
 
 syncable::ModelTypeSet GetRoutingInfoTypes(
     const ModelSafeRoutingInfo& routing_info);
 
+// Extracts a ModelTypeSet containing all types that map to |group| in
+// |routing_info|.
+syncable::FullModelTypeSet GetModelTypesForGroup(
+    ModelSafeGroup group,
+    const ModelSafeRoutingInfo& routing_info);
+
 ModelSafeGroup GetGroupForModelType(const syncable::ModelType type,
                                     const ModelSafeRoutingInfo& routes);
 
 // Maintain the up-to-date state regarding which ModelSafeWorkers exist and
 // which types get routed to which worker.  When a sync session begins, it will
 // snapshot the state at that instant, and will use that for the entire
 // session.  This means if a model becomes synced (or unsynced) by the user
 // during a sync session, that session will complete and be unaware of this
 // change -- it will only get picked up for the next session.
 // TODO(tim): That's really the only way I can make sense of it in the Syncer
@@ skipping 11 matching lines @@
   virtual void GetModelSafeRoutingInfo(ModelSafeRoutingInfo* out) = 0;
  protected:
   virtual ~ModelSafeWorkerRegistrar() {}
  private:
   DISALLOW_COPY_AND_ASSIGN(ModelSafeWorkerRegistrar);
 };
 
 }  // namespace browser_sync
 
 #endif  // SYNC_ENGINE_MODEL_SAFE_WORKER_H_