Every time the Google Chrome browser blocks a pop-up, it tells you about this. If you don't care to be informed every time a pop-up gets blocked, you can customize Google Chrome so that it stops telling when it does this.

From within the Chrome browser, click the Wrench icon in the upper right section of the page and then choose "Options" from the menu.

Go to the "Under the Hood" tab and in the "Web Content" section you'll see a box next to "Notify me when a pop-up is blocked". Uncheck that box, and click the "Close" button and you'll no longer get notifications when the browser blocks a pop-up.