Fix OS/2 bustage introduced by my launchWithURI landing (bug 386078); thanks to Walter Meini <wuno@lsvw.de> for the patch; r+sr=dmose

uriloader/exthandler/os2/nsMIMEInfoOS2.cpp

@@ -63,7 +63,7 @@ nsMIMEInfoOS2::~nsMIMEInfoOS2()
 {
 }
 
-NS_IMETHODIMP nsMIMEInfoOS2::LaunchWithURI(nsIFile* aURI)
+NS_IMETHODIMP nsMIMEInfoOS2::LaunchWithURI(nsIURI* aURI)
 {
   nsresult rv = NS_OK;