Standardize usage of virtual/override/final specifiers in base/.

base/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 "base/bind.h"
 #include "base/callback.h"
 #include "base/prefs/mock_pref_change_callback.h"
 #include "base/prefs/pref_notifier_impl.h"
 #include "base/prefs/pref_observer.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 67 matching lines @@
  public:
   PrefObserverMock() {}
   virtual ~PrefObserverMock() {}
 
   MOCK_METHOD2(OnPreferenceChanged, void(PrefService*, const std::string&));
 };
 
 // Test fixture class.
 class PrefNotifierTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     pref_service_.registry()->RegisterBooleanPref(kChangedPref, true);
     pref_service_.registry()->RegisterBooleanPref(kUnchangedPref, true);
   }
 
   TestingPrefServiceSimple pref_service_;
 
   PrefObserverMock obs1_;
   PrefObserverMock obs2_;
 };
 
@@ skipping 112 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