Revert of Adds TimeDomains to the TaskQueueManager

components/scheduler/base/lazy_now.cc

Index: components/scheduler/base/lazy_now.cc
diff --git a/components/scheduler/base/lazy_now.cc b/components/scheduler/base/lazy_now.cc
index 3492ca6766d7a9098e8e8a532d4d0b48e52d0f77..c80dd472440daed23fc2b274cb11fc0859398edf 100644
--- a/components/scheduler/base/lazy_now.cc
+++ b/components/scheduler/base/lazy_now.cc
@@ -8,10 +8,13 @@
 #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