Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/activity_log/ad_injection_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 "base/prefs/testing_pref_service.h"
 #include "base/time/time.h"
 #include "chrome/browser/extensions/activity_log/activity_actions.h"
 #include "components/rappor/byte_vector_utils.h"
 #include "components/rappor/proto/rappor_metric.pb.h"
 #include "components/rappor/rappor_service.h"
@@ skipping 18 matching lines @@
                    .Append("http://www.google.co.uk")
                    .Build());
   return action;
 }
 
 }  // namespace
 
 class TestRapporService : public rappor::RapporService {
  public:
   TestRapporService();
-  virtual ~TestRapporService();
+  ~TestRapporService() override;
 
   // Returns the active reports. This also clears the internal map of metrics
   // as a biproduct, so if comparing numbers of reports, the comparison should
   // be from the last time GetReports() was called (not from the beginning of
   // the test).
   rappor::RapporReports GetReports();
 
  protected:
   TestingPrefServiceSimple prefs_;
 };
@@ skipping 33 matching lines @@
   EXPECT_EQ(1, reports.report_size());
 
   scoped_refptr<Action> harmless_action =
       CreateAction("Location.replace", "", "");
   harmless_action->DidInjectAd(&rappor_service);
   reports = rappor_service.GetReports();
   EXPECT_EQ(0, reports.report_size());
 }
 
 }  // namespace extensions