sync: Remove ModelTypeInvalidationMap

sync/internal_api/public/engine/model_safe_worker.cc

Index: sync/internal_api/public/engine/model_safe_worker.cc
diff --git a/sync/internal_api/public/engine/model_safe_worker.cc b/sync/internal_api/public/engine/model_safe_worker.cc
index 5c9171521eb4f62b67995a9bf36cac18f4602d8e..eb3fc1f1c3ec286c961e743b23b05e77a7eae358 100644
--- a/sync/internal_api/public/engine/model_safe_worker.cc
+++ b/sync/internal_api/public/engine/model_safe_worker.cc
@@ -31,17 +31,6 @@ std::string ModelSafeRoutingInfoToString(
   return json;
 }
 
-ModelTypeInvalidationMap ModelSafeRoutingInfoToInvalidationMap(
-    const ModelSafeRoutingInfo& routes,
-    const std::string& payload) {
-  ModelTypeInvalidationMap invalidation_map;
-  for (ModelSafeRoutingInfo::const_iterator i = routes.begin();
-       i != routes.end(); ++i) {
-    invalidation_map[i->first].payload = payload;
-  }
-  return invalidation_map;
-}
-
 ModelTypeSet GetRoutingInfoTypes(const ModelSafeRoutingInfo& routing_info) {
   ModelTypeSet types;
   for (ModelSafeRoutingInfo::const_iterator it = routing_info.begin();