[Cleanup] Migrate the DriveMetricsProvider to use the Task Scheduler.

chrome/browser/metrics/chrome_metrics_service_client.cc

 // 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.
 
 #include "chrome/browser/metrics/chrome_metrics_service_client.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <utility>
@@ skipping 626 matching lines @@
           new metrics::GPUMetricsProvider));
 
   metrics_service_->RegisterMetricsProvider(
       std::unique_ptr<metrics::MetricsProvider>(
           new metrics::ScreenInfoMetricsProvider));
 
   metrics_service_->RegisterMetricsProvider(CreateFileMetricsProvider(
       ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled()));
 
   drive_metrics_provider_ = new metrics::DriveMetricsProvider(
-      content::BrowserThread::GetTaskRunnerForThread(
-          content::BrowserThread::FILE),
       chrome::FILE_LOCAL_STATE);
   metrics_service_->RegisterMetricsProvider(
       std::unique_ptr<metrics::MetricsProvider>(drive_metrics_provider_));
 
   profiler_metrics_provider_ = new metrics::ProfilerMetricsProvider();
   metrics_service_->RegisterMetricsProvider(
       std::unique_ptr<metrics::MetricsProvider>(profiler_metrics_provider_));
 
   metrics_service_->RegisterMetricsProvider(
       std::unique_ptr<metrics::MetricsProvider>(
@@ skipping 349 matching lines @@
     ukm_service_->Purge();
     ukm_service_->ResetClientId();
   }
   // Signal service manager to enable/disable UKM based on new state.
   UpdateRunningServices();
 }
 
 bool ChromeMetricsServiceClient::IsHistorySyncEnabledOnAllProfiles() {
   return SyncDisableObserver::IsHistorySyncEnabledOnAllProfiles();
 }