Backing out changeset 46df1731dffc (bug 885615) for causing mochitest-other orange on a CLOSED TREE

toolkit/components/osfile/modules/osfile_async_worker.js

@@ -52,9 +52,6 @@ if (this.Components) {
          LOG("Method", method, "succeeded");
        } catch (ex) {
          exn = ex;
-         if (!exn.stack) {
-           exn.stack = "No stack trace available!";
-         }
          LOG("Error while calling agent method", exn, exn.stack);
        }