Remove usage of FOR_EACH_OBSERVER macro in net

net/proxy/proxy_config_service_mac.cc

Index: net/proxy/proxy_config_service_mac.cc
diff --git a/net/proxy/proxy_config_service_mac.cc b/net/proxy/proxy_config_service_mac.cc
index 1483dbc68efaa3fbe4d3a28eb23002d8afa708ac..1f208267098367a390a5ffd6d743041ecf67be69 100644
--- a/net/proxy/proxy_config_service_mac.cc
+++ b/net/proxy/proxy_config_service_mac.cc
@@ -277,8 +277,8 @@ void ProxyConfigServiceMac::OnProxyConfigChanged(
   last_config_fetched_ = new_config;
 
   // Notify all the observers.
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnProxyConfigChanged(new_config, CONFIG_VALID));
+  for (auto& observer : observers_)
+    observer.OnProxyConfigChanged(new_config, CONFIG_VALID);
 }
 
 }  // namespace net