install() {
    var r = this.replacer_ = new PropertyReplacer();
    r.set(acClient, 'isInitialized', goog.bind(this.isInitialized_, this));
    r.set(acClient, 'init', goog.bind(this.init_, this));
    r.set(
        acClient, 'trySelectAccount', goog.bind(this.trySelectAccount_, this));
    return this;
  }
Installs the fake accountchooser.com client.
@return {!FakeAcClient} The fake accountchooser.com
    client.