Replace Closure in TaskRunner::PostTask with OneShotCallback

base/task_runner.h

Index: base/task_runner.h
diff --git a/base/task_runner.h b/base/task_runner.h
index 9593835eebbdfa51f43e1d236f387f3ee1ac7940..8f72d9913823a5e730d031396e0db35670b90ddb 100644
--- a/base/task_runner.h
+++ b/base/task_runner.h
@@ -62,7 +62,7 @@ class BASE_EXPORT TaskRunner
   //
   // Equivalent to PostDelayedTask(from_here, task, 0).
   bool PostTask(const tracked_objects::Location& from_here,
-                const Closure& task);
+                OnceClosure task);
 
   // Like PostTask, but tries to run the posted task only after
   // |delay_ms| has passed.
@@ -70,7 +70,7 @@ class BASE_EXPORT TaskRunner
   // It is valid for an implementation to ignore |delay_ms|; that is,
   // to have PostDelayedTask behave the same as PostTask.
   virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const Closure& task,
+                               OnceClosure task,
                                base::TimeDelta delay) = 0;
 
   // Returns true if the current thread is a thread on which a task
@@ -123,8 +123,8 @@ class BASE_EXPORT TaskRunner
   //     and the reply will cancel itself safely because it is bound to a
   //     WeakPtr<>.
   bool PostTaskAndReply(const tracked_objects::Location& from_here,
-                        const Closure& task,
-                        const Closure& reply);
+                        OnceClosure task,
+                        OnceClosure reply);
 
  protected:
   friend struct TaskRunnerTraits;