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

base/prefs/overlay_user_pref_store_unittest.cc

 // Copyright (c) 2012 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/prefs/overlay_user_pref_store.h"
 
 #include "base/prefs/pref_store_observer_mock.h"
 #include "base/prefs/testing_pref_store.h"
 #include "base/values.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 19 matching lines @@
 
 class OverlayUserPrefStoreTest : public testing::Test {
  protected:
   OverlayUserPrefStoreTest()
       : underlay_(new TestingPrefStore()),
         overlay_(new OverlayUserPrefStore(underlay_.get())) {
     overlay_->RegisterOverlayPref(overlay_key);
     overlay_->RegisterOverlayPref(mapped_overlay_key, mapped_underlay_key);
   }
 
-  virtual ~OverlayUserPrefStoreTest() {}
+  ~OverlayUserPrefStoreTest() override {}
 
   scoped_refptr<TestingPrefStore> underlay_;
   scoped_refptr<OverlayUserPrefStore> overlay_;
 };
 
 TEST_F(OverlayUserPrefStoreTest, Observer) {
   PrefStoreObserverMock obs;
   overlay_->AddObserver(&obs);
 
   // Check that underlay first value is reported.
@@ skipping 194 matching lines @@
 
   overlay_->RemoveObserver(&obs);
 
   // Check successful unsubscription.
   underlay_->SetValue(mapped_underlay_key, new FundamentalValue(47));
   overlay_->SetValue(mapped_overlay_key, new FundamentalValue(48));
   EXPECT_TRUE(obs.changed_keys.empty());
 }
 
 }  // namespace base