[awqrre]

"Features that communicate with Google made available through the compilation of code in Chromium are subject to the Google Privacy Policy."

from https://www.chromium.org/Home/chromium-privacy

[mthoms]

Any idea what specifically they are referring to?

There is at least some "communication with Google" that could be considered innocuous. For example - accessing their Safe Browsing API (also used by Safari and Firefox).

[witty_username]

Probably signing in with your Google Account on Chromium.