Revert of [scheduler] Add TaskQueue::Observer

third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h

Index: third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h b/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h
index 872cde9e76e2930606c68056041eebbeef013609..1457204c73f1f7e46893eda22dd7649283686be5 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h
@@ -17,6 +17,7 @@ namespace scheduler {
 class BLINK_PLATFORM_EXPORT RealTimeDomain : public TimeDomain {
  public:
   explicit RealTimeDomain(const char* tracing_category);
+  RealTimeDomain(TimeDomain::Observer* observer, const char* tracing_category);
   ~RealTimeDomain() override;
 
   // TimeDomain implementation:
@@ -28,8 +29,8 @@ class BLINK_PLATFORM_EXPORT RealTimeDomain : public TimeDomain {
  protected:
   void OnRegisterWithTaskQueueManager(
       TaskQueueManager* task_queue_manager) override;
-  void RequestWakeUpAt(base::TimeTicks now, base::TimeTicks run_time) override;
-  void CancelWakeUpAt(base::TimeTicks run_time) override;
+  void RequestWakeupAt(base::TimeTicks now, base::TimeTicks run_time) override;
+  void CancelWakeupAt(base::TimeTicks run_time) override;
   void AsValueIntoInternal(
       base::trace_event::TracedValue* state) const override;