Upgrade apps for env:flex. (#241)
Upgrade apps for env:flex. (#241)

* Upgrade apps for env:flex.

* Address comments.

* Fix lint.

* Address comments.

GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples