Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/child/idle_helper.cc

Index: components/scheduler/child/idle_helper.cc
diff --git a/components/scheduler/child/idle_helper.cc b/components/scheduler/child/idle_helper.cc
index b0fb06a8bd400d74ad0cd08ca24e135869b8d243..f007baec665c1234173c7ebc2a37f773a9709017 100644
--- a/components/scheduler/child/idle_helper.cc
+++ b/components/scheduler/child/idle_helper.cc
@@ -93,7 +93,7 @@
   if (long_idle_period_duration >=
       base::TimeDelta::FromMilliseconds(kMinimumIdlePeriodDurationMillis)) {
     *next_long_idle_period_delay_out = long_idle_period_duration;
-    if (!idle_queue_->HasPendingImmediateTask()) {
+    if (idle_queue_->IsQueueEmpty()) {
       return IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED;
     } else if (long_idle_period_duration == max_long_idle_period_duration) {
       return IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE;