Remove usage of FOR_EACH_OBSERVER macro in ios/

ios/net/cookies/cookie_store_ios.mm

Index: ios/net/cookies/cookie_store_ios.mm
diff --git a/ios/net/cookies/cookie_store_ios.mm b/ios/net/cookies/cookie_store_ios.mm
index 2767aa2029ef060e1928bd18e195596f236eaf8a..746e7dae3ce21f8159a6a01f85b6a9d284fd869c 100644
--- a/ios/net/cookies/cookie_store_ios.mm
+++ b/ios/net/cookies/cookie_store_ios.mm
@@ -87,13 +87,13 @@ void NotificationTrampoline::RemoveObserver(CookieNotificationObserver* obs) {
 }
 
 void NotificationTrampoline::NotifyCookiesChanged() {
-  FOR_EACH_OBSERVER(CookieNotificationObserver, observer_list_,
-                    OnSystemCookiesChanged());
+  for (auto& observer : observer_list_)
+    observer.OnSystemCookiesChanged();
 }
 
 void NotificationTrampoline::NotifyCookiePolicyChanged() {
-  FOR_EACH_OBSERVER(CookieNotificationObserver, observer_list_,
-                    OnSystemCookiePolicyChanged());
+  for (auto& observer : observer_list_)
+    observer.OnSystemCookiePolicyChanged();
 }
 
 NotificationTrampoline::NotificationTrampoline() {