Add RetainedRef uses where needed.

base/task/cancelable_task_tracker.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/task/cancelable_task_tracker.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 113 matching lines @@
   // Will be deleted by |untrack_and_delete_flag| after Untrack().
   CancellationFlag* flag = new CancellationFlag();
 
   Closure untrack_and_delete_flag = Bind(
       &RunAndDeleteFlag,
       Bind(&CancelableTaskTracker::Untrack, weak_factory_.GetWeakPtr(), id),
       flag);
 
   // Will always run |untrack_and_delete_flag| on current MessageLoop.
   base::ScopedClosureRunner* untrack_and_delete_flag_runner =
-      new base::ScopedClosureRunner(Bind(&RunOrPostToTaskRunner,
-                                         base::ThreadTaskRunnerHandle::Get(),
-                                         untrack_and_delete_flag));
+      new base::ScopedClosureRunner(
+          Bind(&RunOrPostToTaskRunner,
+               RetainedRef(base::ThreadTaskRunnerHandle::Get()),
+               untrack_and_delete_flag));
 
   *is_canceled_cb =
       Bind(&IsCanceled, flag, base::Owned(untrack_and_delete_flag_runner));
 
   Track(id, flag);
   return id;
 }
 
 void CancelableTaskTracker::TryCancel(TaskId id) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ skipping 34 matching lines @@
   DCHECK(success);
 }
 
 void CancelableTaskTracker::Untrack(TaskId id) {
   DCHECK(thread_checker_.CalledOnValidThread());
   size_t num = task_flags_.erase(id);
   DCHECK_EQ(1u, num);
 }
 
 }  // namespace base