Google has announced plans to implement malware warnings for downloads in Google Chrome. Google is calling these newly expanded warnings "Safe Browsing malicious download warnings." Software that falls into a specific set of criteria, as defined by Chrome, will be flagged as possibly malicious.
To further safeguard you while browsing the web, we recently added new measures to protect you and your computer. These measures will identify software that violates Chrome's standard mechanisms for deploying extensions, flagging such binaries as malware. Within a week, you will start seeing Safe Browsing malicious download warnings when attempting to download malware identified by this criteria.
These specific forms of malware operate by "misusing Chrome's central management settings" or by manipulating Chrome preferences to re-enable silent installs. Of course, you should never download something from a source you don't trust, especially a binary package. A good anti-virus and malware protection plan will only get you so far.