Now using BNodeInfo class to set MIME type, following korli suggestion.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14511 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/print/drivers/pdf/source/PDFWriter.cpp

@@ -268,8 +268,10 @@ PDFWriter::InitWriter()
 	fState = NULL;
 	fStateDepth = 0;
 
-	// Set MIME-type explicit
-	SetAttribute("BEOS:TYPE", "application/pdf");
+	// Set MIME type explicit as we *do* know it's a PDF document
+	BFile * file = dynamic_cast<BFile *>(Transport());
+	if (file)
+		BNodeInfo(file).SetType("application/pdf");
 
 	// pdflib scope: object
 /*