Replace base::Callback with base::OnceCallback in base::PendingTask

base/task_scheduler/task_tracker.h

Index: base/task_scheduler/task_tracker.h
diff --git a/base/task_scheduler/task_tracker.h b/base/task_scheduler/task_tracker.h
index 93769f1751bc1525c8c1cf13cf19b271ea6b1567..1d6599471328eabc8744325d029f7e045996af13 100644
--- a/base/task_scheduler/task_tracker.h
+++ b/base/task_scheduler/task_tracker.h
@@ -57,7 +57,7 @@ class BASE_EXPORT TaskTracker {
   // |sequence_token| is the token identifying the sequence from which |task|
   // was extracted. Returns true if |task| ran. WillPostTask() must have allowed
   // |task| to be posted before this is called.

[fdoray, 2016/10/06 17:37:22]

// |task| is non-const to allow running its OnceClosure. It will not be mutated
in other ways.

[tzik, 2016/10/13 05:58:04]

It's now obsolete after your CL, right?
Its type is now std::unique_ptr<Task>, and now it's clear that RunTask retains
the ownership.

-  bool RunTask(const Task* task, const SequenceToken& sequence_token);
+  bool RunTask(Task* task, const SequenceToken& sequence_token);
 
   // Returns true once shutdown has started (Shutdown() has been called but
   // might not have returned). Note: sequential consistency with the thread