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

base/sequenced_task_runner.h

Index: base/sequenced_task_runner.h
diff --git a/base/sequenced_task_runner.h b/base/sequenced_task_runner.h
index 6b2726ed4fe74c4e1208e1514d391191985692e2..b92bd997e1fc14c76cd3a4aa9a8b900e932edd1f 100644
--- a/base/sequenced_task_runner.h
+++ b/base/sequenced_task_runner.h
@@ -6,6 +6,7 @@
 #define BASE_SEQUENCED_TASK_RUNNER_H_
 
 #include "base/base_export.h"
+#include "base/callback.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/task_runner.h"
 
@@ -109,11 +110,11 @@ class BASE_EXPORT SequencedTaskRunner : public TaskRunner {
   // below.
 
   bool PostNonNestableTask(const tracked_objects::Location& from_here,
-                           const Closure& task);
+                           Closure task);
 
   virtual bool PostNonNestableDelayedTask(
       const tracked_objects::Location& from_here,
-      const Closure& task,
+      Closure task,
       base::TimeDelta delay) = 0;
 
   // Submits a non-nestable task to delete the given object.  Returns