Make implicit semicolon explicit in new try line.

common/content/io.js

@@ -1103,7 +1103,7 @@ lookup:
 IO.PATH_SEP = (function () {
     let file = services.create("file");
     let pathsep = "/";
-    try { file.initWithPath("/") } catch(e) { pathsep = "\\"; }
+    try { file.initWithPath("/"); } catch(e) { pathsep = "\\"; }
     return pathsep;
 })();