Standardize usage of virtual/override/final specifiers.

chrome/browser/autocomplete/zero_suggest_provider_unittest.cc

 // Copyright 2014 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 "chrome/browser/autocomplete/zero_suggest_provider.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 81 matching lines @@
   }
   // content::NotificationObserver:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override {}
 
   // A test-specific field for controlling when most visited callback is run
   // after top sites have been requested.
   GetMostVisitedURLsCallback mv_callback;
  protected:
-  virtual ~FakeEmptyTopSites() {
-  }
+  ~FakeEmptyTopSites() override {}
 };
 
 void FakeEmptyTopSites::GetMostVisitedURLs(
     const GetMostVisitedURLsCallback& callback,
     bool include_forced_urls)  {
   mv_callback = callback;
 }
 
 } // namespace
 
 
 class ZeroSuggestProviderTest : public testing::Test,
                                 public AutocompleteProviderListener {
  public:
   ZeroSuggestProviderTest();
 
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
  protected:
   // AutocompleteProviderListener:
   void OnProviderUpdate(bool updated_matches) override;
 
   void ResetFieldTrialList();
 
   void CreatePersonalizedFieldTrial();
   void CreateMostVisitedFieldTrial();
 
@@ skipping 276 matching lines @@
 
   base::RunLoop().RunUntilIdle();
 
   // Expect that the matches have been cleared.
   ASSERT_TRUE(provider_->matches().empty());
 
   // Expect the new results have been stored.
   EXPECT_EQ(empty_response,
             prefs->GetString(prefs::kZeroSuggestCachedResults));
 }