clang/win: Fix warnings to prepare for building without -Wno-reorder.

device/hid/hid_service_win.cc

Index: device/hid/hid_service_win.cc
diff --git a/device/hid/hid_service_win.cc b/device/hid/hid_service_win.cc
index 82fddff500a18affc622d93b88477ef64d60535b..627cc01e79b9d8b826548172f3c3035209318ca8 100644
--- a/device/hid/hid_service_win.cc
+++ b/device/hid/hid_service_win.cc
@@ -38,8 +38,8 @@ void Noop() {
 
 HidServiceWin::HidServiceWin(
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner)
-    : device_observer_(this),
-      file_task_runner_(file_task_runner),
+    : file_task_runner_(file_task_runner),
+      device_observer_(this),
       weak_factory_(this) {
   task_runner_ = base::ThreadTaskRunnerHandle::Get();
   DCHECK(task_runner_.get());