Remove usage of base::ObserverList<T>::Iter::GetNext() in //components/prefs.

components/prefs/pref_notifier_impl_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "components/prefs/mock_pref_change_callback.h"
 #include "components/prefs/pref_notifier_impl.h"
@@ skipping 41 matching lines @@
   virtual ~MockPrefNotifier() {}
 
   MOCK_METHOD1(FireObservers, void(const std::string& path));
 
   size_t CountObserver(const std::string& path, PrefObserver* obs) {
     PrefObserverMap::const_iterator observer_iterator =
         pref_observers()->find(path);
     if (observer_iterator == pref_observers()->end())
       return false;
 
-    PrefObserverList* observer_list = observer_iterator->second.get();
-    PrefObserverList::Iterator it(observer_list);
-    PrefObserver* existing_obs;
     size_t count = 0;
-    while ((existing_obs = it.GetNext()) != NULL) {
-      if (existing_obs == obs)
+    for (auto& existing_obs : *observer_iterator->second) {
+      if (&existing_obs == obs)
         count++;
     }
 
     return count;
   }
 
   // Make public for tests below.
   using PrefNotifierImpl::OnPreferenceChanged;
   using PrefNotifierImpl::OnInitializationCompleted;
 };
@@ skipping 135 matching lines @@
   EXPECT_CALL(obs2_, OnPreferenceChanged(&pref_service_, kChangedPref));
   notifier.OnPreferenceChanged(kChangedPref);
   Mock::VerifyAndClearExpectations(&obs1_);
   Mock::VerifyAndClearExpectations(&obs2_);
 
   notifier.RemovePrefObserver(kChangedPref, &obs2_);
   notifier.RemovePrefObserver(kUnchangedPref, &obs2_);
 }
 
 }  // namespace