Remove calls to deprecated MessageLoop methods in base.

base/test/sequenced_worker_pool_owner.cc

Index: base/test/sequenced_worker_pool_owner.cc
diff --git a/base/test/sequenced_worker_pool_owner.cc b/base/test/sequenced_worker_pool_owner.cc
index 37bad2b29d25c5e5084cd9e6c69ec87da416d45a..8781495d7d381ddde91088dfd314f9bde03cb7a6 100644
--- a/base/test/sequenced_worker_pool_owner.cc
+++ b/base/test/sequenced_worker_pool_owner.cc
@@ -54,7 +54,8 @@ void SequencedWorkerPoolOwner::WillWaitForShutdown() {
 }
 
 void SequencedWorkerPoolOwner::OnDestruct() {
-  constructor_message_loop_->PostTask(FROM_HERE, exit_loop_.QuitClosure());
+  constructor_message_loop_->task_runner()->PostTask(FROM_HERE,
+                                                     exit_loop_.QuitClosure());
 }
 
 }  // namespace base