Revert of [scheduler] Add TaskQueue::Observer

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

Index: third_party/WebKit/Source/platform/scheduler/base/real_time_domain.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.cc b/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.cc
index 802e56f66b02993bb89c56fc1b5e3b40a8dbf33d..d51dc2f9ef50a6b6c6b4e974d3e5f10578a8d80f 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/real_time_domain.cc
@@ -13,7 +13,15 @@ namespace blink {
 namespace scheduler {
 
 RealTimeDomain::RealTimeDomain(const char* tracing_category)
-    : tracing_category_(tracing_category), task_queue_manager_(nullptr) {}
+    : TimeDomain(nullptr),
+      tracing_category_(tracing_category),
+      task_queue_manager_(nullptr) {}
+
+RealTimeDomain::RealTimeDomain(TimeDomain::Observer* observer,
+                               const char* tracing_category)
+    : TimeDomain(observer),
+      tracing_category_(tracing_category),
+      task_queue_manager_(nullptr) {}
 
 RealTimeDomain::~RealTimeDomain() {}
 
@@ -31,7 +39,7 @@ base::TimeTicks RealTimeDomain::Now() const {
   return task_queue_manager_->Delegate()->NowTicks();
 }
 
-void RealTimeDomain::RequestWakeUpAt(base::TimeTicks now,
+void RealTimeDomain::RequestWakeupAt(base::TimeTicks now,
                                      base::TimeTicks run_time) {
   // NOTE this is only called if the scheduled runtime is sooner than any
   // previously scheduled runtime, or there is no (outstanding) previously
@@ -39,7 +47,7 @@ void RealTimeDomain::RequestWakeUpAt(base::TimeTicks now,
   task_queue_manager_->MaybeScheduleDelayedWork(FROM_HERE, this, now, run_time);
 }
 
-void RealTimeDomain::CancelWakeUpAt(base::TimeTicks run_time) {
+void RealTimeDomain::CancelWakeupAt(base::TimeTicks run_time) {
   task_queue_manager_->CancelDelayedWork(this, run_time);
 }