Remove FOR_EACH_OBSERVER macro usage in chrome/browser/extensions

chrome/browser/extensions/api/mdns/dns_sd_registry.cc

Index: chrome/browser/extensions/api/mdns/dns_sd_registry.cc
diff --git a/chrome/browser/extensions/api/mdns/dns_sd_registry.cc b/chrome/browser/extensions/api/mdns/dns_sd_registry.cc
index e578146cb945563eb754eea4e66b18a8b98685c2..2bafc7c4937b0d1e71492e5bf5f13697590b7040 100644
--- a/chrome/browser/extensions/api/mdns/dns_sd_registry.cc
+++ b/chrome/browser/extensions/api/mdns/dns_sd_registry.cc
@@ -230,8 +230,10 @@ void DnsSdRegistry::ServicesFlushed(const std::string& service_type) {
 
 void DnsSdRegistry::DispatchApiEvent(const std::string& service_type) {
   VLOG(1) << "DispatchApiEvent: service_type: " << service_type;
-  FOR_EACH_OBSERVER(DnsSdObserver, observers_, OnDnsSdEvent(
-      service_type, service_data_map_[service_type]->GetServiceList()));
+  for (auto& observer : observers_) {
+    observer.OnDnsSdEvent(service_type,
+                          service_data_map_[service_type]->GetServiceList());
+  }
 }
 
 bool DnsSdRegistry::IsRegistered(const std::string& service_type) {