Remove implicit conversions from scoped_refptr to T* in device/

This patch was generated by running the rewrite_scoped_refptr clang tool
on a Windows build.

BUG=110610

Review URL: https://codereview.chromium.org/748093002

Cr-Commit-Position: refs/heads/master@{#305241}
diff --git a/device/bluetooth/bluetooth_task_manager_win.cc b/device/bluetooth/bluetooth_task_manager_win.cc
index 2e040c8..4ebaa101 100644
--- a/device/bluetooth/bluetooth_task_manager_win.cc
+++ b/device/bluetooth/bluetooth_task_manager_win.cc
@@ -195,7 +195,7 @@
 
 void BluetoothTaskManagerWin::Shutdown() {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
-  if (worker_pool_)
+  if (worker_pool_.get())
     worker_pool_->Shutdown();
 }