Replace intsafe functions with chromium safe math in Utf8Utf16Convert.cpp #4290
Description
Description of the new feature/enhancement
If #4093 lands we should probably replace the intsafe functions used.
Proposed technical implementation details (optional)
I think #4278 should also be in place first. Otherwise we would be forced to suppress C4100 all the time. And certainly we prefer to use the til namespace anyway.
The places where the intsafe functions are used are methods
til::u8state::operator()
til::u16state::operator()
and the first overloads of functions
til::u8u16
til::u16u8
