This reminds me of the argument that you should run SSH on an non-standard port. Sure, can't hurt. I'm sure it does stop many indiscriminate drive-by attacks. But it's hardly a real security solution. If your SSH server is so weak that it could fall to a drive-by attack then you have much bigger problems.

(And, FWIW, Google's malware blocking applies equally to ads as it does sites you type into the address bar)