Correct const accessors in base/values.(h|cc), Part II (ListValue)

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index b400c511dbed422f9a673e02d32397309c361fe7..415efeb213f27a74a7fb2483661d0c82941dc7c3 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -1676,7 +1676,7 @@ JsArgList GetNodeInfoById(const JsArgList& args,
   ListValue return_args;
   ListValue* node_summaries = new ListValue();
   return_args.Append(node_summaries);
-  ListValue* id_list = NULL;
+  const ListValue* id_list = NULL;
   ReadTransaction trans(FROM_HERE, user_share);
   if (args.Get().GetList(0, &id_list)) {
     CHECK(id_list);