Standardize usage of virtual/override/final specifiers.

chrome/browser/browsing_data/browsing_data_remover_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 "chrome/browser/browsing_data/browsing_data_remover.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 685 matching lines @@
 
 class BrowsingDataRemoverTest : public testing::Test,
                                 public content::NotificationObserver {
  public:
   BrowsingDataRemoverTest()
       : profile_(new TestingProfile()) {
     registrar_.Add(this, chrome::NOTIFICATION_BROWSING_DATA_REMOVED,
                    content::Source<Profile>(profile_.get()));
   }
 
-  virtual ~BrowsingDataRemoverTest() {
-  }
+  ~BrowsingDataRemoverTest() override {}
 
-  virtual void TearDown() {
+  void TearDown() override {
 #if defined(ENABLE_EXTENSIONS)
     mock_policy_ = NULL;
 #endif
 
     // TestingProfile contains a DOMStorageContext.  BrowserContext's destructor
     // posts a message to the WEBKIT thread to delete some of its member
     // variables. We need to ensure that the profile is destroyed, and that
     // the message loop is cleared out, before destroying the threads and loop.
     // Otherwise we leak memory.
     profile_.reset();
@@ skipping 1095 matching lines @@
   EXPECT_EQ(1u, tester.clear_count());
   EXPECT_EQ(CLEAR_CONTEXTS, tester.last_clear_mode());
 }
 
 TEST_F(BrowsingDataRemoverTest, DomainReliability_NoMonitor) {
   BlockUntilBrowsingDataRemoved(
       BrowsingDataRemover::EVERYTHING,
       BrowsingDataRemover::REMOVE_HISTORY |
       BrowsingDataRemover::REMOVE_COOKIES, false);
 }