[Cleanup] Use a sequence checker rather than a thread checker for the metrics service.

chrome/browser/metrics/chrome_metrics_service_client.h

 // Copyright 2014 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_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
 #define CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <deque>
 #include <memory>
 #include <queue>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/thread_checker.h"
+#include "base/sequence_checker.h"
 #include "build/build_config.h"
 #include "chrome/browser/metrics/metrics_memory_details.h"
 #include "components/metrics/metrics_log_uploader.h"
 #include "components/metrics/metrics_service_client.h"
 #include "components/metrics/profiler/tracking_synchronizer_observer.h"
 #include "components/metrics/proto/system_profile.pb.h"
 #include "components/omnibox/browser/omnibox_event_global_tracker.h"
 #include "components/ukm/observers/history_delete_observer.h"
 #include "components/ukm/observers/sync_disable_observer.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 135 matching lines @@
 
   // Called when a URL is opened from the Omnibox.
   void OnURLOpenedFromOmnibox(OmniboxLog* log);
 
 #if defined(OS_WIN)
   // Counts (and removes) the browser crash dump attempt signals left behind by
   // any previous browser processes which generated a crash dump.
   void CountBrowserCrashDumpAttempts();
 #endif  // OS_WIN
 
-  base::ThreadChecker thread_checker_;
+  SEQUENCE_CHECKER(sequence_checker_);
 
   // Weak pointer to the MetricsStateManager.
   metrics::MetricsStateManager* metrics_state_manager_;
 
   // The MetricsService that |this| is a client of.
   std::unique_ptr<metrics::MetricsService> metrics_service_;
 
   // The UkmService that |this| is a client of.
   std::unique_ptr<ukm::UkmService> ukm_service_;
 
@@ skipping 65 matching lines @@
   // Whether this client has already uploaded profiler data during this session.
   // Profiler data is uploaded at most once per session.
   bool has_uploaded_profiler_data_;
 
   base::WeakPtrFactory<ChromeMetricsServiceClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeMetricsServiceClient);
 };
 
 #endif  // CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_