Implement a part of ProcessingInstruction by using PrivateScript

Source/core/dom/StyleEngine.h

Index: Source/core/dom/StyleEngine.h
diff --git a/Source/core/dom/StyleEngine.h b/Source/core/dom/StyleEngine.h
index 2890f003e5579b6d76af59f54283300a9fc162a6..702e4c175d649992bc846e16f2cdd8b93366ae3b 100644
--- a/Source/core/dom/StyleEngine.h
+++ b/Source/core/dom/StyleEngine.h
@@ -88,8 +88,6 @@ public:
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode, TreeScope&);
     void modifiedStyleSheetCandidateNode(Node*);
     void enableExitTransitionStylesheets();
-    void addXSLStyleSheet(ProcessingInstruction*, bool createdByParser);
-    void removeXSLStyleSheet(ProcessingInstruction*);
 
     void invalidateInjectedStyleSheetCache();
     void updateInjectedStyleSheetCache() const;
@@ -186,7 +184,6 @@ private:
     TreeScopeStyleSheetCollection* styleSheetCollectionFor(TreeScope&);
     bool shouldUpdateDocumentStyleSheetCollection(StyleResolverUpdateMode) const;
     bool shouldUpdateShadowTreeStyleSheetCollection(StyleResolverUpdateMode) const;
-    bool shouldApplyXSLTransform() const;
 
     void markTreeScopeDirty(TreeScope&);
 
@@ -255,8 +252,6 @@ private:
 
     WillBeHeapHashMap<AtomicString, RawPtrWillBeMember<StyleSheetContents> > m_textToSheetCache;
     WillBeHeapHashMap<RawPtrWillBeMember<StyleSheetContents>, AtomicString> m_sheetToTextCache;
-
-    RefPtrWillBeMember<ProcessingInstruction> m_xslStyleSheet;
 };
 
 }