First past at removing writing mode.

sky/engine/core/css/resolver/StyleBuilderCustom.cpp

Index: sky/engine/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/sky/engine/core/css/resolver/StyleBuilderCustom.cpp b/sky/engine/core/css/resolver/StyleBuilderCustom.cpp
index 27b8452555ed36f52a5f5cf439e3ca0b7482c8f5..b80cb333e57a364e87b8bd05e9b2343eb60a148d 100644
--- a/sky/engine/core/css/resolver/StyleBuilderCustom.cpp
+++ b/sky/engine/core/css/resolver/StyleBuilderCustom.cpp
@@ -1035,16 +1035,6 @@ void StyleBuilderFunctions::applyValueCSSPropertyPerspective(StyleResolverState&
         state.style()->setPerspective(perspectiveValue);
 }
 
-void StyleBuilderFunctions::applyValueCSSPropertyWebkitWritingMode(StyleResolverState& state, CSSValue* value)
-{
-    if (value->isPrimitiveValue())
-        state.setWritingMode(*toCSSPrimitiveValue(value));
-
-    // FIXME: It is not ok to modify document state while applying style.
-    if (state.element() && state.element() == state.document().documentElement())
-        state.document().setWritingModeSetOnDocumentElement(true);
-}
-
 void StyleBuilderFunctions::applyValueCSSPropertyWebkitTextOrientation(StyleResolverState& state, CSSValue* value)
 {
     if (value->isPrimitiveValue())