Google has been offering protection to users against websites that attempt to distribute malware via drive-by downloads. The new feature will be integrated with Google Chrome and will display a warning if a user attempts to download a suspected malicious executable file:Download warning. This warning will be displayed for any download URL that matches the latest list of malicious websites published by the Safe Browsing API. We hope that the feature will improve our users online experience and help make the Internet a safer place. Were starting with a small-scale experimental phase for a subset of our users who subscribe to the Chrome development release channel.”]
Source: https://security.googleblog.com/2011/04/protecting-users-from-malicious.html