Revert of [scheduler] Add TaskQueue::Observer

third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc

Index: third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
index 46eac1be5ace5030f6e5e9a5f98d357a977d431a..d958f3de56a9734e7303e8019ab434a93b56e0c0 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
@@ -110,7 +110,7 @@ IdleHelper::IdlePeriodState IdleHelper::ComputeNewLongIdlePeriodState(
       return IdlePeriodState::IN_LONG_IDLE_PERIOD;
     }
   } else {
-    // If we can't start the idle period yet then try again after wake-up.
+    // If we can't start the idle period yet then try again after wakeup.
     *next_long_idle_period_delay_out = base::TimeDelta::FromMilliseconds(
         kRetryEnableLongIdlePeriodDelayMillis);
     return IdlePeriodState::NOT_IN_IDLE_PERIOD;