Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/sync/profile_sync_service_typed_url_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 <string>
 #include <utility>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 72 matching lines @@
 namespace {
 
 const char kTestProfileName[] = "test-profile";
 
 // Visits with this timestamp are treated as expired.
 static const int EXPIRED_VISIT = -1;
 
 class HistoryBackendMock : public HistoryBackend {
  public:
   HistoryBackendMock() : HistoryBackend(nullptr, nullptr) {}
-  virtual bool IsExpiredVisitTime(const base::Time& time) override {
+  bool IsExpiredVisitTime(const base::Time& time) override {
     return time.ToInternalValue() == EXPIRED_VISIT;
   }
   MOCK_METHOD1(GetAllTypedURLs, bool(history::URLRows* entries));
   MOCK_METHOD3(GetMostRecentVisitsForURL, bool(history::URLID id,
                                                int max_visits,
                                                history::VisitVector* visits));
   MOCK_METHOD2(UpdateURL, bool(history::URLID id, const history::URLRow& url));
   MOCK_METHOD3(AddVisits, bool(const GURL& url,
                                const std::vector<history::VisitInfo>& visits,
                                history::VisitSource visit_source));
@@ skipping 1017 matching lines @@
   history::URLRows changed_urls;
   changed_urls.push_back(updated_url_entry);
   SendNotificationURLsModified(changed_urls);
 
   history::URLRows new_sync_entries;
   GetTypedUrlsFromSyncDB(&new_sync_entries);
 
   // The change should be ignored.
   ASSERT_EQ(0U, new_sync_entries.size());
 }