[Cleanup] Migrate the WatcherMetricsProvider 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 677 matching lines @@
   base::FilePath user_data_dir;
   base::FilePath crash_dir;
   if (!base::PathService::Get(chrome::DIR_USER_DATA, &user_data_dir) ||
       !base::PathService::Get(chrome::DIR_CRASH_DUMPS, &crash_dir)) {
     // If either call fails, then clear both.
     user_data_dir = base::FilePath();
     crash_dir = base::FilePath();
   }
   watcher_metrics_provider_ = new browser_watcher::WatcherMetricsProviderWin(
       chrome::GetBrowserExitCodesRegistryPath(), user_data_dir, crash_dir,
-      base::Bind(&GetExecutableVersionDetails),
-      content::BrowserThread::GetBlockingPool());
+      base::Bind(&GetExecutableVersionDetails));
   metrics_service_->RegisterMetricsProvider(
       std::unique_ptr<metrics::MetricsProvider>(watcher_metrics_provider_));
 
   antivirus_metrics_provider_ = new AntiVirusMetricsProvider();
 
   metrics_service_->RegisterMetricsProvider(
       std::unique_ptr<metrics::MetricsProvider>(antivirus_metrics_provider_));
 #endif  // defined(OS_WIN)
 
 #if BUILDFLAG(ENABLE_PLUGINS)
@@ skipping 303 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();
 }