views: Switch Checkbox over to LabelButton.

ui/native_theme/native_theme.h

 // 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.
 
 #ifndef UI_NATIVE_THEME_NATIVE_THEME_H_
 #define UI_NATIVE_THEME_NATIVE_THEME_H_
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/native_theme/native_theme_export.h"
@@ skipping 64 matching lines @@
     kWindowResizeGripper,
     kMaxPart,
   };
 
   // The state of the part.
   enum State {
     kDisabled,
     kHovered,
     kNormal,
     kPressed,
+    kToggled,
     kMaxState,
   };
 
   enum MenuVariation {
     MENU_VARIATION_NORMAL,
     MENU_VARIATION_COMPACT_1,
     MENU_VARIATION_COMPACT_2,
     MENU_VARIATION_CONTRAST
   };
 
@@ skipping 211 matching lines @@
   unsigned int thumb_inactive_color_;
   unsigned int thumb_active_color_;
   unsigned int track_color_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTheme);
 };
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_NATIVE_THEME_H_