servo: Merge #18225 - Remove unused selector visitor argument (from...

servo: Merge #18225 - Remove unused selector visitor argument (from jdm:unused-visitor-argument); r=emilio

The real win here is avoiding cloning the iterator when nobody actually uses it.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] There are tests for these changes

Source-Repo: https://github.com/servo/servo
Source-Revision: 69e28f07097d4ebeeff4505802b1fb26072e3844

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 618e8ca0236fcb58864be0b0b14dca47d2a779cb