views: Switch Checkbox over to LabelButton.

ui/views/controls/button/label_button.h

Index: ui/views/controls/button/label_button.h
diff --git a/ui/views/controls/button/label_button.h b/ui/views/controls/button/label_button.h
index b96c7854de60267627dded24aee36ae42f83620f..6233bb438f43719a47c39d3087227653b236f0b2 100644
--- a/ui/views/controls/button/label_button.h
+++ b/ui/views/controls/button/label_button.h
@@ -66,6 +66,10 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
 
+ protected:
+  // Fill |params| with information about the button.
+  virtual void GetExtraParams(ui::NativeTheme::ExtraParams* params) const;
+
  private:
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Init);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Label);
@@ -95,8 +99,6 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   virtual ui::NativeTheme::State GetForegroundThemeState(
       ui::NativeTheme::ExtraParams* params) const OVERRIDE;
 
-  // Fill |params| with information about the button.
-  virtual void GetExtraParams(ui::NativeTheme::ExtraParams* params) const;
 
   // The image and label shown in the button.
   ImageView* image_;