Google's Terms of Service state that "California law will govern all disputes arising out of or relating to these terms, service-specific additional terms, or any related services, regardless of conflict of laws rules. These disputes will be resolved exclusively in the federal or state courts of Santa Clara County, California, USA, and you and Google consent to personal jurisdiction in those courts." [1]. So I suppose as much as any TOS is enforceable.
[1] https://policies.google.com/terms?hl=en-US#toc-problems