Update from https://crrev.com/333737

base/prefs/pref_notifier_impl.h

Index: base/prefs/pref_notifier_impl.h
diff --git a/base/prefs/pref_notifier_impl.h b/base/prefs/pref_notifier_impl.h
index cfd46ff4211ff2ef9196723d83e549e5ececeebe..cbf025c0015a5cfe660a29e06e52b739b70985a9 100644
--- a/base/prefs/pref_notifier_impl.h
+++ b/base/prefs/pref_notifier_impl.h
@@ -47,10 +47,10 @@ class BASE_PREFS_EXPORT PrefNotifierImpl
   // A map from pref names to a list of observers. Observers get fired in the
   // order they are added. These should only be accessed externally for unit
   // testing.
-  typedef ObserverList<PrefObserver> PrefObserverList;
+  typedef base::ObserverList<PrefObserver> PrefObserverList;
   typedef base::hash_map<std::string, PrefObserverList*> PrefObserverMap;
 
-  typedef std::list<base::Callback<void(bool)> > PrefInitObserverList;
+  typedef std::list<base::Callback<void(bool)>> PrefInitObserverList;
 
   const PrefObserverMap* pref_observers() const { return &pref_observers_; }