Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/base/task_queue.cc

Index: components/scheduler/base/task_queue.cc
diff --git a/components/scheduler/base/task_queue.cc b/components/scheduler/base/task_queue.cc
index 24aadb75d78e2f1111955cba76468cd94d756514..857860557c80cd89c7c8946369cb162e425c34b6 100644
--- a/components/scheduler/base/task_queue.cc
+++ b/components/scheduler/base/task_queue.cc
@@ -6,9 +6,8 @@
 
 namespace scheduler {
 
-bool TaskQueue::HasPendingImmediateTask() const {
-  QueueState state = GetQueueState();
-  return state == QueueState::NEEDS_PUMPING || state == QueueState::HAS_WORK;
+bool TaskQueue::IsQueueEmpty() const {
+  return GetQueueState() == QueueState::EMPTY;
 }
 
 }  // namespace scheduler