[putasidemobile]

This is almost surely not content hosted on Google.com, but content hosted on sites which Google redirects to.

If Google serves a single malicious site as a linked result (or in a redirect) it will flag Google.com as hosting malicious content.

This has been the case for years now, also for other Google properties, like Youtube and DoubleClick.

[OJFord]

Right, but it's still odd that other Google TLDs (as reported in this thread) are not flagged.