part 2 - Add a crashtest.

Differential Revision: https://phabricator.services.mozilla.com/D98129

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1679682
gecko-commit: 2bec807450ad6e97b1b4c759291584f568fbb0f1
gecko-reviewers: emilio

Author: Mats Palmgren

css/css-pseudo/file-selector-button-display-none-overflow-crash.html

@@ -0,0 +1,5 @@
+<link rel="author" href="mailto:[email protected]">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1679682">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5049">
+<style>input{width:1px}::file-selector-button{display: none;}</style>
+<input type="file">