[Gecko Bug 1635675] Implement the ::file-chooser-button pseudo-element. #23751
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As per w3c/csswg-drafts#5049.
Don't enable it unconditionally just yet, as the name may change.
I had to move some rules in forms.css because otherwise you get
specificity conflicts.
Differential Revision: https://phabricator.services.mozilla.com/D76214
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1635675
gecko-commit: 82df6f70ec60b3b63bca95f2dfe170e336d84c0c
gecko-integration-branch: autoland
gecko-reviewers: jwatt