Add optional semicolon omitted in 4af80cc

(testing CI after upgrade)

Author: sevaseva

javascript/firefox-driver/extension/components/httpd.js

@@ -836,7 +836,7 @@ nsHttpServer.prototype =
     // Bug 508125: Add a GC here else we'll use gigabytes of memory running
     // mochitests. We can't rely on xpcshell doing an automated GC, as that
     // would interfere with testing GC stuff...
-    gc()
+    gc();
   },
 
   /**