Remove the concept of user stylesheets.

Source/core/dom/StyleEngine.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 40 matching lines @@
 class StyleEngine {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<StyleEngine> create(Document& document) { return adoptPtr(new StyleEngine(document)); }
 
     ~StyleEngine();
 
     const Vector<RefPtr<StyleSheet> >& styleSheetsForStyleSheetList(TreeScope&);
     const Vector<RefPtr<CSSStyleSheet> >& activeAuthorStyleSheets() const;
 
-    CSSStyleSheet* pageUserSheet();
-    const Vector<RefPtr<CSSStyleSheet> >& documentUserStyleSheets() const { return m_userStyleSheets; }
     const Vector<RefPtr<CSSStyleSheet> >& documentAuthorStyleSheets() const { return m_authorStyleSheets; }
     const Vector<RefPtr<CSSStyleSheet> >& injectedAuthorStyleSheets() const;
 
     void modifiedStyleSheet(StyleSheet*);
     void addStyleSheetCandidateNode(Node*, bool createdByParser);
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode = 0);
     void modifiedStyleSheetCandidateNode(Node*);
 
-    void clearPageUserSheet();
-    void updatePageUserSheet();
     void invalidateInjectedStyleSheetCache();
     void updateInjectedStyleSheetCache() const;
 
     void addAuthorSheet(PassRefPtr<StyleSheetContents> authorSheet);
-    void addUserSheet(PassRefPtr<StyleSheetContents> userSheet);
 
     bool needsUpdateActiveStylesheetsOnStyleRecalc() const { return m_needsUpdateActiveStylesheetsOnStyleRecalc; }
 
     bool updateActiveStyleSheets(StyleResolverUpdateMode);
 
     String preferredStylesheetSetName() const { return m_preferredStylesheetSetName; }
     String selectedStylesheetSetName() const { return m_selectedStylesheetSetName; }
     void setPreferredStylesheetSetName(const String& name) { m_preferredStylesheetSetName = name; }
     void setSelectedStylesheetSetName(const String& name) { m_selectedStylesheetSetName = name; }
 
@@ skipping 36 matching lines @@
     static void insertTreeScopeInDocumentOrder(TreeScopeSet&, TreeScope*);
 
     Document& m_document;
 
     // Track the number of currently loading top-level stylesheets needed for rendering.
     // Sheets loaded using the @import directive are not included in this count.
     // We use this count of pending sheets to detect when we can begin attaching
     // elements and when it is safe to execute scripts.
     int m_pendingStylesheets;
 
-    RefPtr<CSSStyleSheet> m_pageUserSheet;
-
     mutable Vector<RefPtr<CSSStyleSheet> > m_injectedAuthorStyleSheets;
     mutable bool m_injectedStyleSheetCacheValid;
 
-    Vector<RefPtr<CSSStyleSheet> > m_userStyleSheets;
     Vector<RefPtr<CSSStyleSheet> > m_authorStyleSheets;
 
     bool m_needsUpdateActiveStylesheetsOnStyleRecalc;
 
     DocumentStyleSheetCollection m_documentStyleSheetCollection;
     HashMap<TreeScope*, OwnPtr<StyleSheetCollection> > m_styleSheetCollectionMap;
 
     TreeScopeSet m_dirtyTreeScopes;
     TreeScopeSet m_activeTreeScopes;
     bool m_needsDocumentStyleSheetsUpdate;
 
     String m_preferredStylesheetSetName;
     String m_selectedStylesheetSetName;
 
     bool m_usesSiblingRules;
     bool m_usesSiblingRulesOverride;
     bool m_usesFirstLineRules;
     bool m_usesFirstLetterRules;
     bool m_usesRemUnits;
     unsigned m_maxDirectAdjacentSelectors;
 };
 
 }
 
 #endif