removing assertion when aData is null since it will always be null and isn't used (removing small part of akkana's patch for 46643) r=bryner

widget/src/gtk/nsClipboard.cpp

@@ -984,21 +984,15 @@ void nsClipboard::SelectionClearCB(GtkWidget *aWidget,
   g_print("  nsClipboard::SelectionClearCB\n");
 #endif /* DEBUG_CLIPBOARD */
 
-  if (!aWidget)
+  if (!aWidget) {
-  {
     NS_ASSERTION(PR_FALSE, "Null widget passed to SelectionClearCB)\n");
     return;
   }
-  if (!aEvent)
+
-  {
+  if (!aEvent) {
     NS_ASSERTION(PR_FALSE, "Null event passed to SelectionClearCB)\n");
     return;
   }
-  if (!aData)
-  {
-    NS_ASSERTION(PR_FALSE, "Null data passed to SelectionClearCB)\n");
-    return;
-  }
 
   nsClipboard *cb = (nsClipboard *)gtk_object_get_data(GTK_OBJECT(aWidget),
                                                        "cb");