Restored line mistakenly deleted with re-factoring.

r313118 removed unused Cloud Devices code.
Cloud Print code must be untouched.

BUG=452871

Review URL: https://codereview.chromium.org/885683002

Cr-Commit-Position: refs/heads/master@{#313553}

chrome/browser/ui/webui/local_discovery/local_discovery_ui_handler.cc

@@ -232,6 +232,8 @@ void LocalDiscoveryUIHandler::HandleRequestDeviceList(
   succeded_list_count_ = 0;
   cloud_devices_.clear();
 
+  cloud_print_printer_list_ = CreateApiFlow();
+
   if (cloud_print_printer_list_) {
     cloud_print_printer_list_->Start(
         make_scoped_ptr<GCDApiFlow::Request>(new CloudPrintPrinterList(this)));