Require FilePathWatcher destructor to be called in sequence with Watch().

chrome/common/service_process_util_win.cc

Index: chrome/common/service_process_util_win.cc
diff --git a/chrome/common/service_process_util_win.cc b/chrome/common/service_process_util_win.cc
index 06711f7109bdc4596307f43099d04da443361563..8bedaf766ee957ea2111de629bf51fd5661155a5 100644
--- a/chrome/common/service_process_util_win.cc
+++ b/chrome/common/service_process_util_win.cc
@@ -135,8 +135,9 @@ bool ServiceProcessState::TakeSingletonLock() {
   return true;
 }
 
-bool ServiceProcessState::SignalReady(base::SingleThreadTaskRunner* task_runner,
-                                      const base::Closure& terminate_task) {
+bool ServiceProcessState::SignalReady(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+    const base::Closure& terminate_task) {
   DCHECK(state_);
   DCHECK(state_->ready_event.IsValid());
   if (!SetEvent(state_->ready_event.Get())) {