Remove all writing mode function arguments and remove writing mode from RenderStyle.

sky/engine/core/dom/Document.h

Index: sky/engine/core/dom/Document.h
diff --git a/sky/engine/core/dom/Document.h b/sky/engine/core/dom/Document.h
index eee1e67b50b6219b03fd7613e3244c308a70e186..6333c6456a3dac939238018316b6e0da9ed8af2c 100644
--- a/sky/engine/core/dom/Document.h
+++ b/sky/engine/core/dom/Document.h
@@ -494,9 +494,7 @@ public:
     DocumentMarkerController& markers() const { return *m_markers; }
 
     bool directionSetOnDocumentElement() const { return m_directionSetOnDocumentElement; }
-    bool writingModeSetOnDocumentElement() const { return m_writingModeSetOnDocumentElement; }
     void setDirectionSetOnDocumentElement(bool b) { m_directionSetOnDocumentElement = b; }
-    void setWritingModeSetOnDocumentElement(bool b) { m_writingModeSetOnDocumentElement = b; }
 
     bool execCommand(const String& command, bool userInterface = false, const String& value = String());
     bool queryCommandEnabled(const String& command);
@@ -840,7 +838,6 @@ private:
     ReferrerPolicy m_referrerPolicy;
 
     bool m_directionSetOnDocumentElement;
-    bool m_writingModeSetOnDocumentElement;
 
     RefPtr<MediaQueryMatcher> m_mediaQueryMatcher;