Make SysColorChangeListener Windows-only instead of having an empty shell.

ui/views/controls/button/label_button.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/views/controls/button/label_button.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "ui/gfx/animation/throb_animation.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/color_utils.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/geometry/vector2d.h"
-#include "ui/gfx/sys_color_change_listener.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/painter.h"
 #include "ui/views/window/dialog_delegate.h"
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "ui/views/linux_ui/linux_ui.h"
 #endif
 
@@ skipping 363 matching lines @@
   SkColor colors[STATE_COUNT] = {
     theme->GetSystemColor(ui::NativeTheme::kColorId_ButtonEnabledColor),
     theme->GetSystemColor(ui::NativeTheme::kColorId_ButtonHoverColor),
     theme->GetSystemColor(ui::NativeTheme::kColorId_ButtonHoverColor),
     theme->GetSystemColor(ui::NativeTheme::kColorId_ButtonDisabledColor),
   };
 
   // Certain styles do not change text color when hovered or pressed.
   bool constant_text_color = false;
   // Use hardcoded colors for inverted color scheme support and STYLE_BUTTON.
-  if (gfx::IsInvertedColorScheme()) {
+  if (color_utils::IsInvertedColorScheme()) {
     constant_text_color = true;
     colors[STATE_NORMAL] = SK_ColorWHITE;
     label_->SetBackgroundColor(SK_ColorBLACK);
     label_->set_background(Background::CreateSolidBackground(SK_ColorBLACK));
     label_->SetAutoColorReadabilityEnabled(true);
     label_->SetShadows(gfx::ShadowValues());
   } else if (style() == STYLE_BUTTON) {
     // TODO(erg): This is disabled on desktop linux because of the binary asset
     // confusion. These details should either be pushed into ui::NativeThemeWin
     // or should be obsoleted by rendering buttons with paint calls instead of
@@ skipping 108 matching lines @@
   GetExtraParams(params);
   return ui::NativeTheme::kHovered;
 }
 
 void LabelButton::ResetCachedPreferredSize() {
   cached_preferred_size_valid_ = false;
   cached_preferred_size_ = gfx::Size();
 }
 
 }  // namespace views