Rewrite base::Bind into base::BindOnce on trivial cases in base

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 72 matching lines @@
 
   // Owned by reply callback below.
   CancellationFlag* flag = new CancellationFlag();
 
   TaskId id = next_id_;
   next_id_++;  // int64_t is big enough that we ignore the potential overflow.
 
   Closure untrack_closure =
       Bind(&CancelableTaskTracker::Untrack, weak_factory_.GetWeakPtr(), id);
   bool success = task_runner->PostTaskAndReply(
-      from_here, Bind(&RunIfNotCanceled, flag, std::move(task)),
-      Bind(&RunIfNotCanceledThenUntrack, base::Owned(flag), std::move(reply),
-           std::move(untrack_closure)));
+      from_here, BindOnce(&RunIfNotCanceled, flag, std::move(task)),
+      BindOnce(&RunIfNotCanceledThenUntrack, base::Owned(flag),
+               std::move(reply), std::move(untrack_closure)));
 
   if (!success)
     return kBadTaskId;
 
   Track(id, flag);
   return id;
 }
 
 CancelableTaskTracker::TaskId CancelableTaskTracker::NewTrackedTaskId(
     IsCanceledCallback* is_canceled_cb) {
@@ skipping 64 matching lines @@
   DCHECK(success);
 }
 
 void CancelableTaskTracker::Untrack(TaskId id) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
   size_t num = task_flags_.erase(id);
   DCHECK_EQ(1u, num);
 }
 
 }  // namespace base