Remove straggling bits of listboxes.

sky/engine/public/platform/WebThemeEngine.h

Index: sky/engine/public/platform/WebThemeEngine.h
diff --git a/sky/engine/public/platform/WebThemeEngine.h b/sky/engine/public/platform/WebThemeEngine.h
index aa3fe1c66830e18e3312cd5062f4298902de2793..460fa23845c21ee448211c3cfddbe1a9d7da8840 100644
--- a/sky/engine/public/platform/WebThemeEngine.h
+++ b/sky/engine/public/platform/WebThemeEngine.h
@@ -101,7 +101,6 @@ public:
         PartCheckbox,
         PartRadio,
         PartButton,
-        PartTextField,
         PartMenuList,
         PartSliderTrack,
         PartSliderThumb,
@@ -131,13 +130,6 @@ public:
         WebColor backgroundColor;
     };
 
-    // Extra parameters for PartTextField
-    struct TextFieldExtraParams {
-        bool isTextArea;
-        bool isListbox;
-        WebColor backgroundColor;
-    };
-
     // Extra parameters for PartMenuList
     struct MenuListExtraParams {
         bool hasBorder;
@@ -173,7 +165,6 @@ public:
     union ExtraParams {
         ScrollbarTrackExtraParams scrollbarTrack;
         ButtonExtraParams button;
-        TextFieldExtraParams textField;
         MenuListExtraParams menuList;
         SliderExtraParams slider;
         InnerSpinButtonExtraParams innerSpin;