Remove unused FunctionalPseudoElement methods

[Gallaecio]

[redapple]

parsel has xpath_attr_functional_pseudo_element which calls function.argument_types(). I haven't tested if this removal affects it See https://github.com/scrapy/parsel/blob/bcfa589e5f15b8f4230a699a0d64a3205732a317/parsel/csstranslator.py#L85

[codecov[bot]]

Codecov Report

Merging #100 (9ba91e9) into master (48bbfb1) will increase coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   96.04%   96.15%   +0.11%     
==========================================
  Files           2        2              
  Lines         884      884              
  Branches      176      176              
==========================================
+ Hits          849      850       +1     
+ Misses         19       18       -1     
  Partials       16       16              

Impacted Files	Coverage Δ
cssselect/parser.py	97.07% <0.00%> (+0.18%)	:arrow_up:

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[Gallaecio]

Thanks, I had no idea of the implications. Switched my approach from removing the code to adding tests for it.