Fix missing newline at end of file

toolkit/components/autocomplete/public/nsIAutoCompleteSearch.idl

@@ -73,4 +73,4 @@ interface nsIAutoCompleteObserver : nsISupports
    * @param result - The search result object
    */
   void onSearchResult(in nsIAutoCompleteSearch search, in nsIAutoCompleteResult result);
-};
+};