Standardize usage of virtual/override/final specifiers.

chrome/browser/captive_portal/captive_portal_service_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/captive_portal/captive_portal_service.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
@@ skipping 72 matching lines @@
 }  // namespace
 
 class CaptivePortalServiceTest : public testing::Test,
                                  public CaptivePortalDetectorTestBase {
  public:
   CaptivePortalServiceTest()
       : old_captive_portal_testing_state_(
             CaptivePortalService::get_state_for_testing()) {
   }
 
-  virtual ~CaptivePortalServiceTest() {
+  ~CaptivePortalServiceTest() override {
     CaptivePortalService::set_state_for_testing(
         old_captive_portal_testing_state_);
   }
 
   // |enable_service| is whether or not the captive portal service itself
   // should be disabled.  This is different from enabling the captive portal
   // detection preference.
   void Initialize(CaptivePortalService::TestingState testing_state) {
     CaptivePortalService::set_state_for_testing(testing_state);
 
@@ skipping 412 matching lines @@
       base::Time::FromString("Tue, 17 Apr 2012 18:02:00 GMT", &start_time));
   SetTime(start_time);
 
   RunTest(captive_portal::RESULT_NO_RESPONSE,
           net::OK,
           503,
           0,
           "HTTP/1.1 503 OK\nRetry-After: Tue, 17 Apr 2012 18:02:51 GMT\n\n");
   EXPECT_EQ(base::TimeDelta::FromSeconds(51), GetTimeUntilNextRequest());
 }