Migrate base::TaskRunner from Closure to OnceClosure

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

 // Copyright 2015 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 "chrome/browser/chromeos/login/users/fake_chrome_user_manager.h"
 
 #include <set>
 
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 19 matching lines @@
 class FakeTaskRunner : public base::TaskRunner {
  public:
   FakeTaskRunner() = default;
 
  protected:
   ~FakeTaskRunner() override {}
 
  private:
   // base::TaskRunner overrides.
   bool PostDelayedTask(const tracked_objects::Location& from_here,
-                       base::Closure task,
+                       base::OnceClosure task,
                        base::TimeDelta delay) override {
     std::move(task).Run();
     return true;
   }
   bool RunsTasksOnCurrentThread() const override { return true; }
 
   DISALLOW_COPY_AND_ASSIGN(FakeTaskRunner);
 };
 
 }  // namespace
@@ skipping 580 matching lines @@
   if (active_account_id_.is_valid()) {
     for (auto* user : users_) {
       if (user->GetAccountId() == active_account_id_)
         return user;
     }
   }
   return users_[0];
 }
 
 }  // namespace chromeos