Get rid of Reset and ResetStyleResolverAndFontSelector.

Source/core/dom/StyleSheetCollection.h

Index: Source/core/dom/StyleSheetCollection.h
diff --git a/Source/core/dom/StyleSheetCollection.h b/Source/core/dom/StyleSheetCollection.h
index 9c9023355ab0cefdf9a7596df7b225c655ea92e7..3db4f856bb7f4cfd547f065f5bf11d7814e1ab18 100644
--- a/Source/core/dom/StyleSheetCollection.h
+++ b/Source/core/dom/StyleSheetCollection.h
@@ -57,7 +57,7 @@ class StyleSheetCollectionBase {
     WTF_MAKE_NONCOPYABLE(StyleSheetCollectionBase); WTF_MAKE_FAST_ALLOCATED;
 public:
     StyleSheetCollectionBase();
-    ~StyleSheetCollectionBase();
+    virtual ~StyleSheetCollectionBase();
 
     Vector<RefPtr<CSSStyleSheet> >& activeAuthorStyleSheets() { return m_activeAuthorStyleSheets; }
     Vector<RefPtr<StyleSheet> >& styleSheetsForStyleSheetList() { return m_styleSheetsForStyleSheetList; }
@@ -77,6 +77,8 @@ protected:
 
 class StyleSheetCollection : public StyleSheetCollectionBase {
 public:
+    bool updateActiveStyleSheets(StyleEngine*, StyleResolverUpdateMode);
+
     void addStyleSheetCandidateNode(Node*, bool createdByParser);
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode);
     bool hasStyleSheetCandidateNodes() const { return !m_styleSheetCandidateNodes.isEmpty(); }
@@ -97,9 +99,7 @@ protected:
 
     enum StyleResolverUpdateType {
         Reconstruct,
-        Reset,
         Additive,
-        ResetStyleResolverAndFontSelector
     };
 
     struct StyleSheetChange {
@@ -112,9 +112,10 @@ protected:
     };
 
     void analyzeStyleSheetChange(StyleResolverUpdateMode, const StyleSheetCollectionBase&, StyleSheetChange&);
-    void resetAllRuleSetsInTreeScope(StyleResolver*);
     void updateUsesRemUnits();
 
+    virtual void collectStyleSheets(StyleEngine*, StyleSheetCollectionBase&) = 0;
+
 private:
     static StyleResolverUpdateType compareStyleSheets(const Vector<RefPtr<CSSStyleSheet> >& oldStyleSheets, const Vector<RefPtr<CSSStyleSheet> >& newStylesheets, Vector<StyleSheetContents*>& addedSheets);
     bool activeLoadingStyleSheetLoaded(const Vector<RefPtr<CSSStyleSheet> >& newStyleSheets);