Refactor History's CommitLaterTask with CancelableCallback

base/task/cancelable_task_tracker.h

Index: base/task/cancelable_task_tracker.h
diff --git a/base/task/cancelable_task_tracker.h b/base/task/cancelable_task_tracker.h
index 959c86f9fd67e781f9e2e19341b20c053e31da79..2e0581998bf4a14e28c95a19f126e3f285740f20 100644
--- a/base/task/cancelable_task_tracker.h
+++ b/base/task/cancelable_task_tracker.h
@@ -95,6 +95,11 @@ class BASE_EXPORT CancelableTaskTracker {
                    base::Owned(result)));
   }
 
+  TaskId PostDelayedTask(base::TaskRunner* task_runner,
+                         const tracked_objects::Location& from_here,
+                         const base::Closure& task,
+                         base::TimeDelta delay);
+
   // Creates a tracked TaskId and an associated IsCanceledCallback. Client can
   // later call TryCancel() with the returned TaskId, and run |is_canceled_cb|
   // from any thread to check whether the TaskId is canceled.