scheduler: Allow timer task to be nested

components/scheduler/child/web_scheduler_impl.cc

Index: components/scheduler/child/web_scheduler_impl.cc
diff --git a/components/scheduler/child/web_scheduler_impl.cc b/components/scheduler/child/web_scheduler_impl.cc
index 5218b9b257b0ba84c4b472124377bd7b4c425861..0a918759dfb2f718cbd6144d79fee9cf20da39fd 100644
--- a/components/scheduler/child/web_scheduler_impl.cc
+++ b/components/scheduler/child/web_scheduler_impl.cc
@@ -101,8 +101,7 @@ void WebSchedulerImpl::postTimerTask(
   scoped_ptr<blink::WebThread::Task> scoped_task(task);
   tracked_objects::Location location(web_location.functionName(),
                                      web_location.fileName(), -1, nullptr);
-  // Timer tasks should not run in a nested messageloop.
-  timer_task_runner_->PostNonNestableDelayedTask(
+  timer_task_runner_->PostDelayedTask(
       location,
       base::Bind(&WebSchedulerImpl::runTask, base::Passed(&scoped_task)),
       base::TimeDelta::FromMilliseconds(delayMs));