Scheduler/child/TimeSource could be replaced with base/time/DefaultTickClock.

components/scheduler/child/time_source.cc

Index: components/scheduler/child/time_source.cc
diff --git a/components/scheduler/child/time_source.cc b/components/scheduler/child/time_source.cc
deleted file mode 100644
index f8cf6c43f23d70223af5d55ce49cb38e540a55b5..0000000000000000000000000000000000000000
--- a/components/scheduler/child/time_source.cc
+++ /dev/null
@@ -1,19 +0,0 @@
-// 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/child/time_source.h"
-
-namespace scheduler {
-
-TimeSource::TimeSource() {
-}
-
-TimeSource::~TimeSource() {
-}
-
-base::TimeTicks TimeSource::Now() const {
-  return base::TimeTicks::Now();
-}
-
-}  // namespace scheduler