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

chrome/browser/metrics/chrome_metrics_service_client.cc

Index: chrome/browser/metrics/chrome_metrics_service_client.cc
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.cc b/chrome/browser/metrics/chrome_metrics_service_client.cc
index d14ba61230f17213dc16157e97c0bcef217a365e..3fbb3d7e559ea497aef4b14fdd1298c41e8ea7dd 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_client.cc
@@ -644,8 +644,6 @@ void ChromeMetricsServiceClient::RegisterMetricsServiceProviders() {
       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_));