Revert of scheduler: Implement task observers

content/renderer/scheduler/renderer_scheduler_impl.cc

Index: content/renderer/scheduler/renderer_scheduler_impl.cc
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.cc b/content/renderer/scheduler/renderer_scheduler_impl.cc
index 3b7ca891d202544fd9bcf5bb0cf6bad9080607b9..2e2da80e3bcaacc735de89fdc184792194fcfd89 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.cc
+++ b/content/renderer/scheduler/renderer_scheduler_impl.cc
@@ -446,16 +446,4 @@
   return INPUT_ACTIVE;
 }
 
-void RendererSchedulerImpl::AddTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-  DCHECK(main_thread_checker_.CalledOnValidThread());
-  task_queue_manager_->AddTaskObserver(task_observer);
-}
-
-void RendererSchedulerImpl::RemoveTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-  DCHECK(main_thread_checker_.CalledOnValidThread());
-  task_queue_manager_->RemoveTaskObserver(task_observer);
-}
-
 }  // namespace content