Migrate base::TaskRunner from Closure to OnceClosure

base/test/null_task_runner.cc

Index: base/test/null_task_runner.cc
diff --git a/base/test/null_task_runner.cc b/base/test/null_task_runner.cc
index 66bdf6ffbde321508d98c1d157536fceb88c9318..476af6325eeaf8ee15b5d055f369eeff510cc7cf 100644
--- a/base/test/null_task_runner.cc
+++ b/base/test/null_task_runner.cc
@@ -11,14 +11,14 @@ NullTaskRunner::NullTaskRunner() {}
 NullTaskRunner::~NullTaskRunner() {}
 
 bool NullTaskRunner::PostDelayedTask(const tracked_objects::Location& from_here,
-                                     Closure task,
+                                     OnceClosure task,
                                      base::TimeDelta delay) {
   return false;
 }
 
 bool NullTaskRunner::PostNonNestableDelayedTask(
     const tracked_objects::Location& from_here,
-    Closure task,
+    OnceClosure task,
     base::TimeDelta delay) {
   return false;
 }