It is time.

ui/native_theme/native_theme.cc

-// Copyright (c) 2012 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 "ui/native_theme/native_theme.h"
-
-#include "ui/native_theme/native_theme_observer.h"
-
-namespace ui {
-
-void NativeTheme::SetScrollbarColors(unsigned inactive_color,
-                                     unsigned active_color,
-                                     unsigned track_color) {
-  thumb_inactive_color_ = inactive_color;
-  thumb_active_color_ = active_color;
-  track_color_ = track_color;
-}
-
-// NativeTheme::instance() is implemented in the platform specific source files,
-// such as native_theme_win.cc or native_theme_linux.cc
-
-void NativeTheme::AddObserver(NativeThemeObserver* observer) {
-  native_theme_observers_.AddObserver(observer);
-}
-
-void NativeTheme::RemoveObserver(NativeThemeObserver* observer) {
-  native_theme_observers_.RemoveObserver(observer);
-}
-
-void NativeTheme::NotifyObservers() {
-  FOR_EACH_OBSERVER(NativeThemeObserver, native_theme_observers_,
-                    OnNativeThemeUpdated(this));
-}
-
-NativeTheme::NativeTheme()
-    : thumb_inactive_color_(0xeaeaea),
-      thumb_active_color_(0xf4f4f4),
-      track_color_(0xd3d3d3) {
-}
-
-NativeTheme::~NativeTheme() {}
-
-}  // namespace ui