message: Megolm export: fix test
diff: @@ -21,12 +21,6 @@ import * as MegolmExportEncryption from 'utils/MegolmExportEncryption';
  import * as testUtils from '../test-utils';
  import expect from 'expect';
  -// polyfill textencoder if necessary
  -let TextEncoder = window.TextEncoder;
  -if (!TextEncoder) {
  - TextEncoder = require('utils/TextEncoderPolyfill');
  -}
  -
  const TEST_VECTORS=[
  [
  "plain",
  