Remove usage of SequencedWorkerPool::GetNamedSequenceToken from ChromeDownloadManagerDelegate.

chrome/browser/chromeos/drive/download_handler.h

Index: chrome/browser/chromeos/drive/download_handler.h
diff --git a/chrome/browser/chromeos/drive/download_handler.h b/chrome/browser/chromeos/drive/download_handler.h
index d42b84539346d0ae65f766045e6d95ecdf7087f4..1cff079beb64dd05e42232233ccead29727f89aa 100644
--- a/chrome/browser/chromeos/drive/download_handler.h
+++ b/chrome/browser/chromeos/drive/download_handler.h
@@ -71,9 +71,8 @@ class DownloadHandler : public AllDownloadItemNotifier::Observer {
   bool IsDriveDownload(const content::DownloadItem* download);
 
   // Checks a file corresponding to the download item exists in Drive.
-  void CheckForFileExistence(
-      const content::DownloadItem* download,
-      const content::CheckForFileExistenceCallback& callback);
+  void CheckForFileExistence(const content::DownloadItem* download,
+                             content::CheckForFileExistenceCallback callback);
 
   // Calculates request space for |downloads|.
   int64_t CalculateRequestSpace(