Adds a new arg to the PP call. The new arg is not being used, it is

for future and is needed for the API freeze.
Bug 144716 r=dcone sr=attinasi

suite/browser/browser.js

@@ -252,7 +252,7 @@ function BrowserPrintPreview()
       Components.interfaces.nsIWebBrowserPrint);     
     if (webBrowserPrint) {
       gPrintSettings = GetPrintSettings();
-      webBrowserPrint.printPreview(gPrintSettings, null);
+      webBrowserPrint.printPreview(gPrintSettings, null, null);
     }
 
     // show the toolbar after we go into print preview mode so
@@ -289,7 +289,7 @@ function BrowserPrintSetup()
           psService.savePrintSettingsToPrefs(gPrintSettings, false, gPrintSettings.kInitSaveNativeData);
         }
         if (webBrowserPrint.doingPrintPreview) {
-          webBrowserPrint.printPreview(gPrintSettings, null);
+          webBrowserPrint.printPreview(gPrintSettings, null, null);
         }
       }
     }