Revert of Adds TimeDomains to the TaskQueueManager

components/scheduler/base/lazy_now.cc

 // Copyright 2015 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/base/lazy_now.h"
 
 #include "base/time/tick_clock.h"
 #include "components/scheduler/base/task_queue_manager.h"
 
 namespace scheduler {
+namespace internal {
+
 base::TimeTicks LazyNow::Now() {
   if (now_.is_null())
     now_ = tick_clock_->NowTicks();
   return now_;
 }
 
+}  // namespace internal
 }  // namespace scheduler