Harmony - Use FocusableBorder for comboboxes on Mac

ui/views/style/platform_style_mac.mm

Index: ui/views/style/platform_style_mac.mm
diff --git a/ui/views/style/platform_style_mac.mm b/ui/views/style/platform_style_mac.mm
index ddb21d100c737a283618c3c67fb20d73f3ee7563..c8317df0316f99f8ec9d3dff0ca91d0301bacc34 100644
--- a/ui/views/style/platform_style_mac.mm
+++ b/ui/views/style/platform_style_mac.mm
@@ -11,9 +11,7 @@
 #include "ui/gfx/vector_icons_public.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/views/controls/button/label_button.h"
-#include "ui/views/controls/focusable_rounded_border_mac.h"
 #import "ui/views/controls/scrollbar/cocoa_scroll_bar.h"
-#include "ui/views/style/mac/combobox_background_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
@@ -48,17 +46,6 @@ gfx::ImageSkia PlatformStyle::CreateComboboxArrow(bool is_enabled,
 }
 
 // static
-std::unique_ptr<FocusableBorder> PlatformStyle::CreateComboboxBorder() {
-  return base::WrapUnique(new FocusableRoundedBorder);
-}
-
-// static
-std::unique_ptr<Background> PlatformStyle::CreateComboboxBackground(
-    int shoulder_width) {
-  return base::MakeUnique<ComboboxBackgroundMac>(shoulder_width);
-}
-
-// static
 std::unique_ptr<ScrollBar> PlatformStyle::CreateScrollBar(bool is_horizontal) {
   return base::MakeUnique<CocoaScrollBar>(is_horizontal);
 }