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

components/scheduler/renderer/throttled_time_domain.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "components/scheduler/renderer/throttled_time_domain.h"
-
-#include "base/time/tick_clock.h"
-
-namespace scheduler {
-
-ThrottledTimeDomain::ThrottledTimeDomain(TimeDomain::Observer* observer,
-                                         base::TickClock* tick_clock)
-    : VirtualTimeDomain(observer, tick_clock->NowTicks()),
-      tick_clock_(tick_clock) {}
-
-ThrottledTimeDomain::~ThrottledTimeDomain() {}
-
-base::TimeTicks ThrottledTimeDomain::ComputeDelayedRunTime(
-    base::TimeTicks,
-    base::TimeDelta delay) const {
-  // We ignore the |time_domain_now| parameter since its the virtual time but we
-  // need to use the current real time when computing the delayed runtime.  If
-  // don't do that, throttled timers may fire sooner than expected.
-  return tick_clock_->NowTicks() + delay;
-}
-
-const char* ThrottledTimeDomain::GetName() const {
-  return "ThrottledTimeDomain";
-}
-
-}  // namespace scheduler