Pass Callback to TaskRunner by value and consume it on invocation (1)

components/user_manager/fake_user_manager.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 "components/user_manager/fake_user_manager.h"
 
 #include <algorithm>
 
 #include "base/callback.h"
+#include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/sys_info.h"
 #include "base/task_runner.h"
 #include "chromeos/chromeos_switches.h"
 #include "components/user_manager/user_names.h"
 #include "components/user_manager/user_type.h"
 
 namespace {
 
 class FakeTaskRunner : public base::TaskRunner {
  public:
   bool PostDelayedTask(const tracked_objects::Location& from_here,
-                       const base::Closure& task,
+                       base::Closure task,
                        base::TimeDelta delay) override {
-    task.Run();
+    base::ResetAndReturn(&task).Run();
     return true;
   }
   bool RunsTasksOnCurrentThread() const override { return true; }
 
  protected:
   ~FakeTaskRunner() override {}
 };
 
 }  // namespace
 
@@ skipping 317 matching lines @@
   NOTIMPLEMENTED();
   return;
 }
 
 bool FakeUserManager::IsValidDefaultUserImageId(int image_index) const {
   NOTIMPLEMENTED();
   return false;
 }
 
 }  // namespace user_manager