} // namespace
-TaskRunners::TaskRunners(base::SingleThreadTaskRunner* shell_runner)
+TaskRunners::TaskRunners(
+ const scoped_refptr<base::SingleThreadTaskRunner>& shell_runner)
: shell_runner_(shell_runner),
io_thread_(CreateIOThread("io_thread")),
blocking_pool_(new base::SequencedWorkerPool(kMaxBlockingPoolThreads,