The Google Play services are a set of apps and services (libraries) giving access to third-party apps to use Google's proprietary APIs for Maps. Google+, YouTube and more. It consists of two parts: The Google Play services client library and The Google Play services apk.
The Google Play Services client library
The client library allows apps to get user authorization for individual Google services and it contains the UI elements needed for these actions.
This Update came on 07.02.2018. Apart from other fixes, it solves the issue with beta OPT-INs which was introduced around a month ago.
Here is the issue description
Since the last week, many people started to see this message "To view this content install and set up a web browsing app"
This issue is happening when somebody is clicking on the link like "https://play.google.com/apps/testing/..." on his mobile device.
Google Play has a mechanism to OPT-IN to the beta/alpha release channel for some Android apps which is done via these links. Looks like it happens because Google Play now intercepts all BROWSE Android intents to URL with play.google.com domain.