Remove the (broken and unneeded) 'force_update' option from ServiceWatcher::DiscoverNewDevices.

chrome/tools/service_discovery_sniffer/service_discovery_sniffer.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/tools/service_discovery_sniffer/service_discovery_sniffer.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/at_exit.h"
@@ skipping 56 matching lines @@
 ServiceTypePrinter::ServiceTypePrinter(ServiceDiscoveryClient* client,
                                        const std::string& service_type)
     : client_(client)  {
   watcher_ = client_->CreateServiceWatcher(
       service_type, base::Bind(&ServiceTypePrinter::OnServiceUpdated,
                                base::Unretained(this)));
 }
 
 void ServiceTypePrinter::Start() {
   watcher_->Start();
-  watcher_->DiscoverNewServices(false);
+  watcher_->DiscoverNewServices();
 }
 
 ServiceTypePrinter::~ServiceTypePrinter() {
 }
 
 void ServiceTypePrinter::OnServiceUpdated(ServiceWatcher::UpdateType update,
                                           const std::string& service_name) {
   if (update == ServiceWatcher::UPDATE_ADDED) {
     services_[service_name].reset(new ServicePrinter(client_, service_name));
     services_[service_name]->Added();
@@ skipping 28 matching lines @@
   {
     // To guarantee/make explicit the ordering constraint.
     local_discovery::ServiceTypePrinter print_changes(
         service_discovery_client.get(),
         std::string(argv[1]) + "._tcp.local");
 
     print_changes.Start();
     base::RunLoop().Run();
   }
 }