Make PendingTask move-only and pass it by value on retaining params

base/message_loop/message_pump_perftest.cc

Index: base/message_loop/message_pump_perftest.cc
diff --git a/base/message_loop/message_pump_perftest.cc b/base/message_loop/message_pump_perftest.cc
index 7bb942fa657707f2e9de8112d3e3b868435aa33e..6cf89bdf74492e5da9b7b142a19f0e4d6c8c3bb8 100644
--- a/base/message_loop/message_pump_perftest.cc
+++ b/base/message_loop/message_pump_perftest.cc
@@ -271,7 +271,7 @@ class PostTaskTest : public testing::Test {
         TaskQueue loop_local_queue;
         queue->ReloadWorkQueue(&loop_local_queue);
         while (!loop_local_queue.empty()) {
-          PendingTask t = loop_local_queue.front();
+          PendingTask t = std::move(loop_local_queue.front());
           loop_local_queue.pop();
           loop.RunTask(t);
         }