txStylesheetSink is used as notificationCallbacks for XSLT channels: http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/content/xslt/src/xslt/txMozillaStylesheetCompiler.cpp&mark=531,534&rev=1.58#504 It implements nsIStreamListener, but I don't see how that implementation is ever used, since it's GetInterface implementation doesn't handle it.
sicking points out this is also passed to asyncOpen, so the nsIStreamListener is used there. Going to morph this into "remove nsIAuthPrompt forwarding in txStylesheetSink::GetInterface", per bug 422808.
Summary: txStylesheetSink used as a notificationCallbacks, but its ::GetInterface can only return nsIAuthPrompt → remove nsIAuthPrompt forwarding in txStylesheetSink::GetInterface
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