Add RetainedRef uses where needed.

storage/browser/fileapi/file_system_context.cc

Index: storage/browser/fileapi/file_system_context.cc
diff --git a/storage/browser/fileapi/file_system_context.cc b/storage/browser/fileapi/file_system_context.cc
index 6d84f1ed05d9b579da3be9ca6b777d6b631bdf18..eddc593fd8edf8d9a489b78afa662a3db5407527 100644
--- a/storage/browser/fileapi/file_system_context.cc
+++ b/storage/browser/fileapi/file_system_context.cc
@@ -429,15 +429,12 @@ void FileSystemContext::DeleteFileSystem(
   }
 
   base::PostTaskAndReplyWithResult(
-      default_file_task_runner(),
-      FROM_HERE,
+      default_file_task_runner(), FROM_HERE,
       // It is safe to pass Unretained(quota_util) since context owns it.
       base::Bind(&FileSystemQuotaUtil::DeleteOriginDataOnFileTaskRunner,
                  base::Unretained(backend->GetQuotaUtil()),
-                 make_scoped_refptr(this),
-                 base::Unretained(quota_manager_proxy()),
-                 origin_url,
-                 type),
+                 base::RetainedRef(this),
+                 base::Unretained(quota_manager_proxy()), origin_url, type),
       callback);
 }