Data: Use a PDF object instead of a Java applet for acceptData testing

This should fix "Java out of date" errors on BrowserStack.

(cherry-picked from 087d280ad1160de53a45ea96184911194f7b46e0)

Fixes gh-1938
Closes gh-2028

test/unit/data.js

@@ -136,7 +136,7 @@ test("Data is not being set on comment and text nodes", function() {
 test("jQuery.acceptData", function() {
 	expect( 11 );
 
-	var flash, applet;
+	var flash, pdf;
 
 	ok( jQuery.acceptData( document ), "document" );
 	ok( jQuery.acceptData( document.documentElement ), "documentElement" );
@@ -148,9 +148,9 @@ test("jQuery.acceptData", function() {
 	flash.setAttribute( "classid", "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" );
 	ok( jQuery.acceptData( flash ), "flash" );
 
-	applet = document.createElement( "object" );
-	applet.setAttribute( "classid", "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" );
-	ok( !jQuery.acceptData( applet ), "applet" );
+	pdf = document.createElement( "object" );
+	pdf.setAttribute( "classid", "clsid:CA8A9780-280D-11CF-A24D-444553540000" );
+	ok( !jQuery.acceptData( pdf ), "pdf" );
 
 	ok( !jQuery.acceptData( document.createComment( "" ) ), "comment" );
 	ok( !jQuery.acceptData( document.createTextNode( "" ) ), "text" );