Google has their sights set on other areas of the PC security market as well, such as anti-virus. Their motives aren't clear, but their actions are:
Itís clear that Google is pushing aggressively into the anti-malware market to clean up its own search results and provide protection to end users and this deal signals the companyís intent to use the browser as the entry point to get on desktops.
This is probably a good thing. The anti-virus market is dominated primarily by Symantec and McAfee, with other players like TrendMicro filling niche needs, and the anti-malware market is composed primarily of freelance work. A company like Google might be able to offer something a cut above what we currently have. Considering the rapidly increasing threats that rogue sites bring, more powerful anti-malware software may be in order.