This header held a bunch of utility functions shared across several code
generators. The only user of any of these utilities now is the public
suffix generator. Move the one used function to that generator, and
remove the common header.
After d2c7e1ea7d, there is now only one
user of LibPublicSuffix - the URL sanitation utility within LibWebView.
Rather than having an entire library for the small Public Suffix data
accessor, merge it into LibWebView.
