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

chrome/browser/metrics/variations/variations_seed_store_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/metrics/variations/variations_seed_store.h"
 
 #include "base/base64.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "chrome/common/pref_names.h"
 #include "components/variations/proto/study.pb.h"
 #include "components/variations/proto/variations_seed.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chrome_variations {
 
 namespace {
 
 class TestVariationsSeedStore : public VariationsSeedStore {
  public:
   explicit TestVariationsSeedStore(PrefService* local_state)
       : VariationsSeedStore(local_state) {}
-  virtual ~TestVariationsSeedStore() {}
+  ~TestVariationsSeedStore() override {}
 
   bool StoreSeedForTesting(const std::string& seed_data) {
     return StoreSeedData(seed_data, std::string(), base::Time::Now(), NULL);
   }
 
-  virtual VariationsSeedStore::VerifySignatureResult VerifySeedSignature(
+  VariationsSeedStore::VerifySignatureResult VerifySeedSignature(
       const std::string& seed_bytes,
       const std::string& base64_seed_signature) override {
     return VariationsSeedStore::VARIATIONS_SEED_SIGNATURE_ENUM_SIZE;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestVariationsSeedStore);
 };
 
 
@@ skipping 227 matching lines @@
             seed_store.VerifySeedSignature(seed_data, base64_seed_data));
 #endif
 
   // Using a different seed should not match the signature.
   seed_data[0] = 'x';
   EXPECT_EQ(VariationsSeedStore::VARIATIONS_SEED_SIGNATURE_INVALID_SEED,
             seed_store.VerifySeedSignature(seed_data, base64_seed_signature));
 }
 
 }  // namespace chrome_variations