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

components/scheduler/base/time_domain_unittest.cc

Index: components/scheduler/base/time_domain_unittest.cc
diff --git a/components/scheduler/base/time_domain_unittest.cc b/components/scheduler/base/time_domain_unittest.cc
index 111b726df0ca7081e3486b6fd32686dfe7e4a33c..efcd3fc805ab305ba049323eea1e9f66acdd810e 100644
--- a/components/scheduler/base/time_domain_unittest.cc
+++ b/components/scheduler/base/time_domain_unittest.cc
@@ -38,11 +38,6 @@
 
   // TimeSource implementation:
   LazyNow CreateLazyNow() override { return LazyNow(now_); }
-
-  base::TimeTicks ComputeDelayedRunTime(base::TimeTicks time_domain_now,
-                                        base::TimeDelta delay) const override {
-    return time_domain_now + delay;
-  }
 
   void AsValueIntoInternal(
       base::trace_event::TracedValue* state) const override {}