Reduce usage of FOR_EACH_OBSERVER macro in components/

components/update_client/update_client.cc

Index: components/update_client/update_client.cc
diff --git a/components/update_client/update_client.cc b/components/update_client/update_client.cc
index db4b21bb5bf4c6aa4c836a25336a903ac5a22cd9..848e539f00604be3eac880a12cdcb0f2bf097365 100644
--- a/components/update_client/update_client.cc
+++ b/components/update_client/update_client.cc
@@ -187,7 +187,8 @@ void UpdateClientImpl::RemoveObserver(Observer* observer) {
 void UpdateClientImpl::NotifyObservers(Observer::Events event,
                                        const std::string& id) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  FOR_EACH_OBSERVER(Observer, observer_list_, OnEvent(event, id));
+  for (auto& observer : observer_list_)
+    observer.OnEvent(event, id);
 }
 
 bool UpdateClientImpl::GetCrxUpdateState(const std::string& id,