Revert of [cherrypick] Fix computation of runtime for throttled tasks

components/scheduler/base/real_time_domain.cc

Index: components/scheduler/base/real_time_domain.cc
diff --git a/components/scheduler/base/real_time_domain.cc b/components/scheduler/base/real_time_domain.cc
index 28c96affad71c924a14c9a823c0fdb8a921d2aac..5c92648f17071a33ef512dc168d805a61c4ddbab 100644
--- a/components/scheduler/base/real_time_domain.cc
+++ b/components/scheduler/base/real_time_domain.cc
@@ -24,12 +24,6 @@
 
 LazyNow RealTimeDomain::CreateLazyNow() {
   return task_queue_manager_->CreateLazyNow();
-}
-
-base::TimeTicks RealTimeDomain::ComputeDelayedRunTime(
-    base::TimeTicks time_domain_now,
-    base::TimeDelta delay) const {
-  return time_domain_now + delay;
 }
 
 void RealTimeDomain::RequestWakeup(LazyNow* lazy_now, base::TimeDelta delay) {