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

chrome/browser/chromeos/login/users/mock_user_manager.cc

Index: chrome/browser/chromeos/login/users/mock_user_manager.cc
diff --git a/chrome/browser/chromeos/login/users/mock_user_manager.cc b/chrome/browser/chromeos/login/users/mock_user_manager.cc
index 828db9f833daca8c6fcf888bc879544ed31e6194..716e43d77ee60a8292caabb775b27a4472cceaf9 100644
--- a/chrome/browser/chromeos/login/users/mock_user_manager.cc
+++ b/chrome/browser/chromeos/login/users/mock_user_manager.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/chromeos/login/users/mock_user_manager.h"
 
+#include "base/callback_helpers.h"
 #include "base/task_runner.h"
 #include "chrome/browser/chromeos/login/users/fake_supervised_user_manager.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
@@ -13,9 +14,9 @@ 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; }