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

base/prefs/pref_change_registrar_unittest.cc

 // Copyright (c) 2010 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/bind_helpers.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/prefs/pref_observer.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/testing_pref_service.h"
@@ skipping 18 matching lines @@
 
   MOCK_METHOD2(AddPrefObserver, void(const std::string&, PrefObserver*));
   MOCK_METHOD2(RemovePrefObserver, void(const std::string&, PrefObserver*));
 };
 
 }  // namespace
 
 class PrefChangeRegistrarTest : public testing::Test {
  public:
   PrefChangeRegistrarTest() {}
-  virtual ~PrefChangeRegistrarTest() {}
+  ~PrefChangeRegistrarTest() override {}
 
  protected:
-  virtual void SetUp() override;
+  void SetUp() override;
 
   base::Closure observer() const {
     return base::Bind(&base::DoNothing);
   }
 
   MockPrefService* service() const { return service_.get(); }
 
  private:
   scoped_ptr<MockPrefService> service_;
 };
@@ skipping 136 matching lines @@
   pref_service_->SetUserPref(kHomePageIsNewTabPage,
                              new FundamentalValue(true));
   Mock::VerifyAndClearExpectations(this);
 
   EXPECT_CALL(*this, OnPreferenceChanged(_)).Times(0);
   pref_service_->SetUserPref(kApplicationLocale, new StringValue("en_US.utf8"));
   Mock::VerifyAndClearExpectations(this);
 }
 
 }  // namespace base