don't force garbage collection in httpd.js for firefox when connectio…

…ns are closed

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...
    Components.utils.forceGC();
    gc()
  },

  /**