The latest version of Google Chrome for MAC has this new TAB spam. When you open a new page or tab, Google wants to try and sell you something (you are the product) :
While you can hide this by clicking the link there, it’s probably just a matter of time until they do it again. I’m thinking, that new tab is too valuable for an ad display to leave it blank.
Using an old trick from Firefox you can configure the Preferences to open a blank page ( or any other page for that matter) by filling in this field. Less likely to get more google spam in the future.