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

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

Index: chrome/browser/chromeos/login/users/fake_chrome_user_manager.cc
diff --git a/chrome/browser/chromeos/login/users/fake_chrome_user_manager.cc b/chrome/browser/chromeos/login/users/fake_chrome_user_manager.cc
index 645140d3de57e593e1972d3fd73a4d4d274983a9..b8437bdd1b0f096bc7f89d18ef611de4fd8be6e6 100644
--- a/chrome/browser/chromeos/login/users/fake_chrome_user_manager.cc
+++ b/chrome/browser/chromeos/login/users/fake_chrome_user_manager.cc
@@ -6,6 +6,8 @@
 
 #include <set>
 
+#include "base/callback.h"
+#include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/sys_info.h"
@@ -36,9 +38,9 @@ class FakeTaskRunner : public base::TaskRunner {
  private:
   // base::TaskRunner overrides.
   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; }