setValue_(msg, sendResponse) {
    this.api_.updateSelectedContent(
        msg.recipients, msg.value, msg.send, sendResponse,
        goog.bind(this.errorHandler_, this, sendResponse), msg.subject);
  }
Sets the value into the active element.
@param {e2e.ext.messages.BridgeMessageResponse} msg The response bridge
    message from the extension.
@param {function(boolean)|function(Error)} sendResponse Function sending
    back the response.
@private