Use OnceClosure in TestPendingTask

base/test/test_pending_task.cc

Index: base/test/test_pending_task.cc
diff --git a/base/test/test_pending_task.cc b/base/test/test_pending_task.cc
index 87b107e83845a86d5677981f1aed70e89e582a47..98bc0179b8e0b91a4734f80d5c566a12bf13225e 100644
--- a/base/test/test_pending_task.cc
+++ b/base/test/test_pending_task.cc
@@ -22,7 +22,9 @@ TestPendingTask::TestPendingTask(
       delay(delay),
       nestability(nestability) {}
 
-TestPendingTask::TestPendingTask(const TestPendingTask& other) = default;
+TestPendingTask::TestPendingTask(TestPendingTask&& other) = default;
+
+TestPendingTask& TestPendingTask::operator=(TestPendingTask&& other) = default;
 
 TimeTicks TestPendingTask::GetTimeToRun() const {
   return post_time + delay;