Harmony - Use FocusableBorder for comboboxes on Mac

ui/views/style/platform_style.h

Index: ui/views/style/platform_style.h
diff --git a/ui/views/style/platform_style.h b/ui/views/style/platform_style.h
index 3e390abe1f3c63a8f346cc6f2f05e84cf0be0712..b4cf8deba49e45b235a1634ad8ef74d6903e5c70 100644
--- a/ui/views/style/platform_style.h
+++ b/ui/views/style/platform_style.h
@@ -62,13 +62,6 @@ class VIEWS_EXPORT PlatformStyle {
   static gfx::ImageSkia CreateComboboxArrow(bool is_enabled,
                                             Combobox::Style style);
 
-  // Creates the appropriate border for a focusable Combobox.
-  static std::unique_ptr<FocusableBorder> CreateComboboxBorder();
-
-  // Creates the appropriate background for a Combobox.
-  static std::unique_ptr<Background> CreateComboboxBackground(
-      int shoulder_width);
-
   // Creates the default scrollbar for the given orientation.
   static std::unique_ptr<ScrollBar> CreateScrollBar(bool is_horizontal);