message: Remove auto refresh on focus
  This snuck in from another branch - I hadn't meant to commit it. I don't think refreshing on focus is necessarily the right thing to do.
diff: @@ -48,7 +48,6 @@ class ActivityTracker extends React.Component<Props> {
  private refreshSubscription: () => void = _.noop;
  componentDidMount() {
  - document.addEventListener('focus', this.visibilityHandler);
  document.addEventListener('visibilitychange', this.visibilityHandler);
  document.addEventListener('online', this.refreshAccountData);
  @@ -68,7 +67,6 @@ class ActivityTracker extends React.Component<Props> {
  }
  componentWillUnmount() {
  - document.removeEventListener('focus', this.visibilityHandler);
  document.removeEventListener('visibilitychange', this.visibilityHandler);
  document.removeEventListener('online', this.refreshAccountData);
  this.clearTimer();
  