views: remove PlatformStyle combobox hooks

ui/views/style/platform_style.cc

Index: ui/views/style/platform_style.cc
diff --git a/ui/views/style/platform_style.cc b/ui/views/style/platform_style.cc
index ca8625589159254abcf270df7b282bcda00bef8b..bf6d76723c956f46d4deb5014941bbc553686117 100644
--- a/ui/views/style/platform_style.cc
+++ b/ui/views/style/platform_style.cc
@@ -36,7 +36,6 @@ const SkColor kStyleButtonShadowColor = SK_ColorWHITE;
 
 #if !defined(OS_MACOSX)
 
-const int PlatformStyle::kComboboxNormalArrowPadding = 7;
 const int PlatformStyle::kMinLabelButtonWidth = 70;
 const int PlatformStyle::kMinLabelButtonHeight = 33;
 const bool PlatformStyle::kDefaultLabelButtonHasBoldFont = true;
@@ -54,13 +53,6 @@ const bool PlatformStyle::kUseRipples = true;
 const bool PlatformStyle::kMirrorBubbleArrowInRTLByDefault = true;
 
 // static
-gfx::ImageSkia PlatformStyle::CreateComboboxArrow(bool is_enabled,
-                                                  Combobox::Style style) {
-  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-  return *rb.GetImageSkiaNamed(IDR_MENU_DROPARROW);
-}
-
-// static
 std::unique_ptr<ScrollBar> PlatformStyle::CreateScrollBar(bool is_horizontal) {
 #if defined(OS_CHROMEOS)
   return base::MakeUnique<OverlayScrollBar>(is_horizontal);