Standardize usage of virtual/override/final specifiers.

chrome/browser/sync/test/integration/performance/dictionary_sync_perf_test.cc

 // Copyright (c) 2011 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/strings/string_number_conversions.h"
 #include "chrome/browser/sync/test/integration/dictionary_helper.h"
 #include "chrome/browser/sync/test/integration/performance/sync_timing_helper.h"
 #include "chrome/browser/sync/test/integration/profile_sync_service_harness.h"
 #include "chrome/browser/sync/test/integration/sync_test.h"
 #include "chrome/common/spellcheck_common.h"
 
 class DictionarySyncPerfTest : public SyncTest {
  public:
   DictionarySyncPerfTest() : SyncTest(TWO_CLIENT) {}
-  virtual ~DictionarySyncPerfTest() {}
+  ~DictionarySyncPerfTest() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DictionarySyncPerfTest);
 };
 
 IN_PROC_BROWSER_TEST_F(DictionarySyncPerfTest, P0) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
   dictionary_helper::LoadDictionaries();
   ASSERT_TRUE(dictionary_helper::DictionariesMatch());
 
@@ skipping 12 matching lines @@
   for (size_t i = 0;
        i < chrome::spellcheck_common::MAX_SYNCABLE_DICTIONARY_WORDS;
        ++i) {
     ASSERT_TRUE(dictionary_helper::RemoveWord(
         0, "foo" + base::Uint64ToString(i)));
   }
   dt = SyncTimingHelper::TimeMutualSyncCycle(GetClient(0), GetClient(1));
   ASSERT_EQ(0UL, dictionary_helper::GetDictionarySize(1));
   SyncTimingHelper::PrintResult("dictionary", "remove_words", dt);
 }