Replace Closure in TaskRunner::PostTask with OneShotCallback

base/message_loop/message_loop.h

 // Copyright 2013 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.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 
 #include <memory>
 #include <queue>
 #include <string>
@@ skipping 187 matching lines @@
   //
   // The MessageLoop takes ownership of the Task, and deletes it after it has
   // been Run().
   //
   // PostTask(from_here, task) is equivalent to
   // PostDelayedTask(from_here, task, 0).
   //
   // NOTE: These methods may be called on any thread.  The Task will be invoked
   // on the thread that executes MessageLoop::Run().
   void PostTask(const tracked_objects::Location& from_here,
-                const Closure& task);
+                OnceClosure task);
 
   void PostDelayedTask(const tracked_objects::Location& from_here,
-                       const Closure& task,
+                       OnceClosure task,
                        TimeDelta delay);
 
   // A variant on PostTask that deletes the given object.  This is useful
   // if the object needs to live until the next run of the MessageLoop (for
   // example, deleting a RenderProcessHost from within an IPC callback is not
   // good).
   //
   // NOTE: This method may be called on any thread.  The object will be deleted
   // on the thread that executes MessageLoop::Run().
   template <class T>
@@ skipping 181 matching lines @@
   bool HasHighResolutionTasks();
 
   // Returns true if the message loop is "idle". Provided for testing.
   bool IsIdleForTesting();
 
   // Returns the TaskAnnotator which is used to add debug information to posted
   // tasks.
   debug::TaskAnnotator* task_annotator() { return &task_annotator_; }
 
   // Runs the specified PendingTask.
-  void RunTask(const PendingTask& pending_task);
+  void RunTask(PendingTask pending_task);
 
 #if defined(OS_WIN)
   // TODO (stanisc): crbug.com/596190: Remove this after the signaling issue
   // has been investigated.
   // This should be used for diagnostic only. If message pump wake-up mechanism
   // is based on auto-reset event this call would reset the event to unset
   // state.
   bool MessagePumpWasSignaled();
 #endif
 
@@ skipping 302 matching lines @@
 
 // Do not add any member variables to MessageLoopForIO!  This is important b/c
 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
 // data that you need should be stored on the MessageLoop's pump_ instance.
 static_assert(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
               "MessageLoopForIO should not have extra member variables");
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_