message: Remove the message on migrating crypto data
  This was for when the new and old versions were available
  concurrently on /develop and /app.
  The various migration steps are still logged to the console in
  js-sdk.
diff: @@ -1171,18 +1171,6 @@ export default React.createClass({
  cli.on("crypto.warning", (type) => {
  const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
  switch (type) {
  - case 'CRYPTO_WARNING_ACCOUNT_MIGRATED':
  - Modal.createTrackedDialog('Crypto migrated', '', ErrorDialog, {
  - title: _t('Cryptography data migrated'),
  - description: _t(
  - "A one-off migration of cryptography data has been performed. "+
  - "End-to-end encryption will not work if you go back to an older "+
  - "version of Riot. If you need to use end-to-end cryptography on "+
  - "an older version, log out of Riot first. To retain message history, "+
  - "export and re-import your keys.",
  - ),
  - });
  - break;
  case 'CRYPTO_WARNING_OLD_VERSION_DETECTED':
  Modal.createTrackedDialog('Crypto migrated', '', ErrorDialog, {
  title: _t('Old cryptography data detected'),
  