There are several services and binaries. Some examples are Google host detector, Google URL tracker, Google cloud messaging, Google hotwording, Safe browsing, password saving feature naggs you to sign-in, translation etc. There are also a lot of binaries that are bundled, but im not really an expert on those.
The store comes to mind, but see, for example, the inox patchset[1], part of ungoogled-chromium[2], which tries to minimize what Chromium calls home for (e.g. a bunch of extensions, Google accounts, and a few services which sync data with/ping the Google servers).
