Remove FOR_EACH_OBSERVER macro usage in chrome/browser/extensions

chrome/browser/extensions/blacklist.cc

Index: chrome/browser/extensions/blacklist.cc
diff --git a/chrome/browser/extensions/blacklist.cc b/chrome/browser/extensions/blacklist.cc
index 151715663833d5bb1b1829ac10be323b8fd6e272..52378ef206b34471f82f0f9744e49b6e71434642 100644
--- a/chrome/browser/extensions/blacklist.cc
+++ b/chrome/browser/extensions/blacklist.cc
@@ -353,7 +353,8 @@ void Blacklist::Observe(int type,
                         const content::NotificationSource& source,
                         const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_SAFE_BROWSING_UPDATE_COMPLETE, type);
-  FOR_EACH_OBSERVER(Observer, observers_, OnBlacklistUpdated());
+  for (auto& observer : observers_)
+    observer.OnBlacklistUpdated();
 }
 
 }  // namespace extensions