Make enable_service_discovery a chrome/ feature.

chrome/browser/extensions/api/mdns/dns_sd_registry.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/browser/extensions/api/mdns/dns_sd_registry.h"
 
 #include <utility>
 
 #include "base/stl_util.h"
 #include "chrome/browser/extensions/api/mdns/dns_sd_device_lister.h"
 #include "chrome/browser/local_discovery/service_discovery_shared_client.h"
+#include "chrome/common/features.h"
 
 using local_discovery::ServiceDiscoveryClient;
 using local_discovery::ServiceDiscoverySharedClient;
 
 namespace extensions {
 
 namespace {
 // Predicate to test if two discovered services have the same service_name.
 class IsSameServiceName {
  public:
@@ skipping 78 matching lines @@
   service_list_.clear();
   return true;
 }
 
 const DnsSdRegistry::DnsSdServiceList&
 DnsSdRegistry::ServiceTypeData::GetServiceList() {
   return service_list_;
 }
 
 DnsSdRegistry::DnsSdRegistry() {
-#if defined(ENABLE_SERVICE_DISCOVERY)
+#if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
   service_discovery_client_ = ServiceDiscoverySharedClient::GetInstance();
 #endif
 }
 
 DnsSdRegistry::DnsSdRegistry(ServiceDiscoverySharedClient* client) {
   service_discovery_client_ = client;
 }
 
 DnsSdRegistry::~DnsSdRegistry() {}
 
@@ skipping 110 matching lines @@
   VLOG(1) << "DispatchApiEvent: service_type: " << service_type;
   FOR_EACH_OBSERVER(DnsSdObserver, observers_, OnDnsSdEvent(
       service_type, service_data_map_[service_type]->GetServiceList()));
 }
 
 bool DnsSdRegistry::IsRegistered(const std::string& service_type) {
   return service_data_map_.find(service_type) != service_data_map_.end();
 }
 
 }  // namespace extensions