[Cleanup] Migrate the StatisticsProvider to use the TaskScheduler

chrome/browser/metrics/chromeos_metrics_provider.h

Index: chrome/browser/metrics/chromeos_metrics_provider.h
diff --git a/chrome/browser/metrics/chromeos_metrics_provider.h b/chrome/browser/metrics/chromeos_metrics_provider.h
index 293c0af4c57c9ec3468d81b577f4abca0f0cf078..9ed27564fa868c9fbbce29ed49260580b1a228c9 100644
--- a/chrome/browser/metrics/chromeos_metrics_provider.h
+++ b/chrome/browser/metrics/chromeos_metrics_provider.h
@@ -66,8 +66,8 @@ class ChromeOSMetricsProvider : public metrics::MetricsProvider {
       metrics::ChromeUserMetricsExtension* uma_proto) override;
 
  private:
-  // Called on the FILE thread to load hardware class information.
-  void InitTaskGetHardwareClassOnFileThread();
+  // Called on a background thread to load hardware class information.
+  void InitTaskGetHardwareClassOnBackgroundThread();
 
   // Update the number of users logged into a multi-profile session.
   // If the number of users change while the log is open, the call invalidates