Pass Callback by value on PostTaskAndReply family

base/threading/worker_pool.h

Index: base/threading/worker_pool.h
diff --git a/base/threading/worker_pool.h b/base/threading/worker_pool.h
index 1f1b8186e050bf0a5a7d848f9b7286792c7348c5..865948e437e7e0832909680c98bb82ff5ad0707c 100644
--- a/base/threading/worker_pool.h
+++ b/base/threading/worker_pool.h
@@ -6,7 +6,7 @@
 #define BASE_THREADING_WORKER_POOL_H_
 
 #include "base/base_export.h"
-#include "base/callback_forward.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 
 namespace tracked_objects {
@@ -38,8 +38,8 @@ class BASE_EXPORT WorkerPool {
   // for |task| is a worker thread and you can specify |task_is_slow| just
   // like you can for PostTask above.
   static bool PostTaskAndReply(const tracked_objects::Location& from_here,
-                               const Closure& task,
-                               const Closure& reply,
+                               Closure task,
+                               Closure reply,
                                bool task_is_slow);
 
   // Return true if the current thread is one that this WorkerPool runs tasks