ga.js connects this plugin

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I checked the site with “PageSpeed Insights” and found script https://www.google-analytics.com/ga.js

in the source code pages do not have this script.
but Google found it on the site.

I began to disable plug-ins on one by one to find where the script is connected.

I found that if i disable the plugin AddToAny Share Buttons – the script is not found by Google.
enable the plugin AddToAny Share Buttons – the script is.

so I have a question:
Why this script is included in the plugin? why it does not appear in the code of the site? how to disable it?