scheduler: Remove task observer shenanigans

components/scheduler/child/scheduler_task_runner_delegate_impl.cc

Index: components/scheduler/child/scheduler_task_runner_delegate_impl.cc
diff --git a/components/scheduler/child/scheduler_task_runner_delegate_impl.cc b/components/scheduler/child/scheduler_task_runner_delegate_impl.cc
index 57df355e0bad1485bcf9f512162a6f190bf22f1a..0c34554b10675f665d04bd6235704d73624915ff 100644
--- a/components/scheduler/child/scheduler_task_runner_delegate_impl.cc
+++ b/components/scheduler/child/scheduler_task_runner_delegate_impl.cc
@@ -54,14 +54,4 @@ bool SchedulerTaskRunnerDelegateImpl::IsNested() const {
   return message_loop_->IsNested();
 }
 
-void SchedulerTaskRunnerDelegateImpl::AddTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-  message_loop_->AddTaskObserver(task_observer);
-}
-
-void SchedulerTaskRunnerDelegateImpl::RemoveTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-  message_loop_->RemoveTaskObserver(task_observer);
-}
-
 }  // namespace scheduler