Jonas Jenwald 6d2863f80a Simplify the fallback-logic in the default viewer
After [bug 1705327](https://bugzilla.mozilla.org/show_bug.cgi?id=1705327) the `ChromeActions.fallback`-method is now just a stub[1], since the fallback bar was removed.
Hence there's no good reason, as far as I can tell, to keep this code in the viewer itself when it's completely unused.

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[1] See https://searchfox.org/mozilla-central/rev/292d17c13daa61016fd082e2337297091d53a015/toolkit/components/pdfjs/content/PdfStreamConverter.jsm#575-581
2022-03-02 13:30:45 +01:00
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