Open Google Chrome and click on the Menu button on the top right corner of the window.
Click on Settings.
Once you open settings, go to Advanced Settings at the bottom of the Settings page.
In Advanced Settings, go to Content Settings in Privacy and Security.
In Content Settings, select Popups.
Turn off the popups by disabling the button (Allowed to Blocked).
Any sites can be blocked by adding them in the Block section.
Popups can be allowed to any websites of your choice by adding them in allow section.