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

sync/engine/model_safe_worker.cc

Index: sync/engine/model_safe_worker.cc
diff --git a/sync/engine/model_safe_worker.cc b/sync/engine/model_safe_worker.cc
index a5aa04fde23334b01d668e065bf5c5427d42cf10..c343995f0cc395ada46c29d60fd6896440a29ec1 100644
--- a/sync/engine/model_safe_worker.cc
+++ b/sync/engine/model_safe_worker.cc
@@ -39,6 +39,18 @@ syncable::ModelTypeSet GetRoutingInfoTypes(
   return types;
 }
 
+syncable::FullModelTypeSet GetModelTypesForGroup(
+    ModelSafeGroup group,
+    const ModelSafeRoutingInfo& routing_info) {
+  syncable::FullModelTypeSet result;
+  for (ModelSafeRoutingInfo::const_iterator it = routing_info.begin();
+       it != routing_info.end(); ++it) {
+    if (it->second == group)
+      result.Put(it->first);
+  }
+  return result;
+}
+
 ModelSafeGroup GetGroupForModelType(const syncable::ModelType type,
                                     const ModelSafeRoutingInfo& routes) {
   ModelSafeRoutingInfo::const_iterator it = routes.find(type);