Material Design: Fix MdLabelButton not updating text colors on theme changes

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 6228ab2b26d2c66aa1379a730c9e972aedcf452d..307e783c69558ce5693a9f68cd369c21e164a766 100644
--- a/ui/views/controls/button/label_button.h
+++ b/ui/views/controls/button/label_button.h
@@ -114,6 +114,8 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
     return explicitly_set_colors_[STATE_NORMAL];
   }
 
+  void ResetExplicitnessOfEnabledTextColors();
+
   // Returns the available area for the label and image. Subclasses can change
   // these bounds if they need room to do manual painting.
   virtual gfx::Rect GetChildAreaBounds();