Follows-up 472a914c63 (I706ef8a50aafb51), which moved various
functions here en-mass, but these two don't require any state.
The warnings about parse_url() in UrlUtils.php have been obsolete
since about PHP 5.4, when it started to support protocol-relative
URLs, non-slash protocols like "mailto", and deal with spaces/newlines
correctly (https://3v4l.org/YWUkl).
Rather than complicate many components that would otherwise remain
stateless and unit-testable, fix these to once again be the static
functions they were.
For impact, see upto PS17 of change I5117eab95f57297eb02bed.
Bug: T227900
Change-Id: Ifb3f720fc429b107348644c98eb9cd8e1113a42a
b862174dc0