It is time.

ui/native_theme/native_theme_switches.cc

Index: ui/native_theme/native_theme_switches.cc
diff --git a/ui/native_theme/native_theme_switches.cc b/ui/native_theme/native_theme_switches.cc
deleted file mode 100644
index 873af518985c1dc6226256118424e2a6493dd086..0000000000000000000000000000000000000000
--- a/ui/native_theme/native_theme_switches.cc
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2014 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 "base/command_line.h"
-#include "ui/native_theme/native_theme_switches.h"
-
-namespace switches {
-
-// Enables overlay scrollbars on Aura or Linux. Does nothing on Mac.
-const char kEnableOverlayScrollbar[] = "enable-overlay-scrollbar";
-
-// Disables overlay scrollbars on Aura or Linux. Does nothing on Mac.
-const char kDisableOverlayScrollbar[] = "disable-overlay-scrollbar";
-
-}  // namespace switches
-
-namespace ui {
-
-bool IsOverlayScrollbarEnabled() {
-  const base::CommandLine& command_line =
-      *base::CommandLine::ForCurrentProcess();
-
-  if (command_line.HasSwitch(switches::kDisableOverlayScrollbar))
-    return false;
-  else if (command_line.HasSwitch(switches::kEnableOverlayScrollbar))
-    return true;
-
-  return false;
-}
-
-}  // namespace ui