Remove usage of FOR_EACH_OBSERVER macro in components/sync

components/sync/base/sync_prefs.cc

Index: components/sync/base/sync_prefs.cc
diff --git a/components/sync/base/sync_prefs.cc b/components/sync/base/sync_prefs.cc
index 6f5d5c0c719c2985e90eedc0b9eb10c6fc4e6149..173a059ac43b31b0dccba57b3d1fa14bd062088b 100644
--- a/components/sync/base/sync_prefs.cc
+++ b/components/sync/base/sync_prefs.cc
@@ -341,8 +341,8 @@ void SyncPrefs::SetSpareBootstrapToken(const std::string& token) {
 
 void SyncPrefs::OnSyncManagedPrefChanged() {
   DCHECK(CalledOnValidThread());
-  FOR_EACH_OBSERVER(SyncPrefObserver, sync_pref_observers_,
-                    OnSyncManagedPrefChange(*pref_sync_managed_));
+  for (auto& observer : sync_pref_observers_)
+    observer.OnSyncManagedPrefChange(*pref_sync_managed_);
 }
 
 void SyncPrefs::SetManagedForTest(bool is_managed) {