Duck Google's data grab
Google insists there's nothing to see here. "It's completely opt-in, if people don't choose this new system, their Google experience doesn't change," a Google spokesperson said in an email.
When Facebook did something similar, it required users to opt-out.
For those surprised to find they've somehow opted-in without meaning to, visiting the Google Account Activity Controls page provides a checkbox to disable the mingling of Chrome browsing with other Google services and the means to delete such data entirely.