MacViews: Style BUTTON_STYLE buttons using the "modern" UI

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 a8f419c96fabd120b146bfdba16ffe1f945b9794..8e869cfd4e38adc0293bc2bf2e60e1fd777aeed0 100644
--- a/ui/views/controls/button/label_button.h
+++ b/ui/views/controls/button/label_button.h
@@ -146,7 +146,6 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Image);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, LabelAndImage);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, FontList);
-  FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, ButtonStyleIsDefaultSize);
 
   void SetTextInternal(const base::string16& text);
 
@@ -167,6 +166,11 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   // as false.
   void ResetCachedPreferredSize();
 
+  // Updates additional state related to focus or default status, rather than
+  // merely the CustomButton::state(). E.g. ensures the label text color is
+  // correct for the current background.
+  void HighlightStateChanged();
+
   // The image and label shown in the button.
   ImageView* image_;
   Label* label_;