[Cleanup] Migrate the StatisticsProvider to use the TaskScheduler

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 320ce28ef6a12f8847d5d7af3d8b760e8bf247f3..ebddc814ebfde1e6f6ff6937510912ffd0aa1f56 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -620,8 +620,6 @@ void ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun() {
   // will ensure that loading is aborted on early exit.
   bool load_oem_statistics = !StartupUtils::IsOobeCompleted();
   system::StatisticsProvider::GetInstance()->StartLoadingMachineStatistics(
-      content::BrowserThread::GetTaskRunnerForThread(
-          content::BrowserThread::FILE),
       load_oem_statistics);
 
   base::FilePath downloads_directory;