Remove the PDFViewerApplication._delayedFallback
functionality
#13250
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According to a decision by UX and PM, please see https://bugzilla.mozilla.org/show_bug.cgi?id=1705060#c2 (and implemented in https://bugzilla.mozilla.org/show_bug.cgi?id=1705327), we no longer show the notification-bar in Firefox; hence the special
PDFViewerApplication._delayedFallback
functionality should no longer be necessary.Furthermore, note that at this point in time most of the features which used the
PDFViewerApplication._delayedFallback
functionality is now enabled by default; hence that provides even less reason to keep this code around and existing calls are thus converted to "regular"PDFViewerApplication.fallback
calls.