Replace deprecated base::NonThreadSafe in chrome/browser/chromeos in favor of SequenceChecker.

chrome/browser/chromeos/net/network_portal_detector_impl.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_NET_NETWORK_PORTAL_DETECTOR_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_NET_NETWORK_PORTAL_DETECTOR_IMPL_H_
 
 #include <memory>
 #include <string>
 
 #include "base/cancelable_callback.h"
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "chromeos/network/network_state_handler_observer.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 #include "chromeos/network/portal_detector/network_portal_detector_strategy.h"
 #include "components/captive_portal/captive_portal_detector.h"
 #include "components/captive_portal/captive_portal_types.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "net/url_request/url_fetcher.h"
 #include "url/gurl.h"
 
 class NetworkingConfigTest;
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace chromeos {
 
 class NetworkPortalNotificationController;
 class NetworkState;
 
 // This class handles all notifications about network changes from
 // NetworkStateHandler and delegates portal detection for the default
 // network to CaptivePortalService.
 class NetworkPortalDetectorImpl : public NetworkPortalDetector,
-                                  public base::NonThreadSafe,
                                   public chromeos::NetworkStateHandlerObserver,
                                   public content::NotificationObserver,
                                   public PortalDetectorStrategy::Delegate {
  public:
   static const char kOobeDetectionResultHistogram[];
   static const char kOobeDetectionDurationHistogram[];
   static const char kOobeShillOnlineHistogram[];
   static const char kOobeShillPortalHistogram[];
   static const char kOobeShillOfflineHistogram[];
   static const char kOobePortalToOnlineHistogram[];
@@ skipping 196 matching lines @@
 
   // Last received result from captive portal detector.
   CaptivePortalStatus last_detection_result_ = CAPTIVE_PORTAL_STATUS_UNKNOWN;
 
   // Number of detection attempts with same result in a row.
   int same_detection_result_count_ = 0;
 
   // Number of detection attempts in a row with NO RESPONSE result.
   int no_response_result_count_ = 0;
 
+  // Must be declared before |notification_controller_| as
+  // ~NetworkPortalNotificationController() calls
+  // NetworkPortalDetectorImpl::RemoveObserver() which uses this.
+  SEQUENCE_CHECKER(sequence_checker_);
+
   // UI notification controller about captive portal state.
   std::unique_ptr<NetworkPortalNotificationController> notification_controller_;
 
   content::NotificationRegistrar registrar_;
 
   // Test time ticks used by unit tests.
   base::TimeTicks time_ticks_for_testing_;
 
   // Contents of a last log message about completed detection attempt.
   DetectionAttemptCompletedReport attempt_completed_report_;
 
   base::WeakPtrFactory<NetworkPortalDetectorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkPortalDetectorImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NET_NETWORK_PORTAL_DETECTOR_IMPL_H_