diff --git a/engine/core/dom/Document.cpp b/engine/core/dom/Document.cpp
index 31801212848..d4284fd180d 100644
--- a/engine/core/dom/Document.cpp
+++ b/engine/core/dom/Document.cpp
@@ -2697,8 +2697,6 @@ void Document::removedStyleSheet(CSSStyleSheet* sheet)
     // If we're in document teardown, then we don't need this notification of our sheet's removal.
     // styleResolverChanged() is needed even when the document is inactive so that
     // imported docuements (which is inactive) notifies the change to the master document.
-    if (isActive())
-        styleEngine()->modifiedStyleSheet(sheet);
     styleResolverChanged();
 }
 
@@ -2707,8 +2705,6 @@ void Document::modifiedStyleSheet(CSSStyleSheet* sheet)
     // If we're in document teardown, then we don't need this notification of our sheet's removal.
     // styleResolverChanged() is needed even when the document is inactive so that
     // imported docuements (which is inactive) notifies the change to the master document.
-    if (isActive())
-        styleEngine()->modifiedStyleSheet(sheet);
     styleResolverChanged();
 }
 
diff --git a/engine/core/dom/StyleEngine.cpp b/engine/core/dom/StyleEngine.cpp
index 4d84959b30c..7c98b0581b4 100644
--- a/engine/core/dom/StyleEngine.cpp
+++ b/engine/core/dom/StyleEngine.cpp
@@ -105,21 +105,6 @@ StyleSheetCollection* StyleEngine::styleSheetCollectionFor(TreeScope& treeScope)
     return it->value.get();
 }
 
-void StyleEngine::modifiedStyleSheet(CSSStyleSheet* sheet)
-{
-    if (!sheet)
-        return;
-
-    Node* node = sheet->ownerNode();
-    if (!node || !node->inDocument())
-        return;
-
-    TreeScope& treeScope = isHTMLStyleElement(*node) ? node->treeScope() : *m_document;
-    ASSERT(isHTMLStyleElement(node) || treeScope == m_document);
-
-    markTreeScopeDirty(treeScope);
-}
-
 void StyleEngine::addStyleSheetCandidateNode(Node* node, bool createdByParser)
 {
     if (!node->inDocument())
@@ -131,7 +116,6 @@ void StyleEngine::addStyleSheetCandidateNode(Node* node, bool createdByParser)
     ASSERT(collection);
     collection->addStyleSheetCandidateNode(node, createdByParser);
 
-    markTreeScopeDirty(treeScope);
     if (treeScope != m_document)
         m_activeTreeScopes.add(&treeScope);
 }
@@ -144,7 +128,6 @@ void StyleEngine::removeStyleSheetCandidateNode(Node* node, ContainerNode* scopi
     ASSERT(collection);
     collection->removeStyleSheetCandidateNode(node, scopingNode);
 
-    markTreeScopeDirty(treeScope);
     m_activeTreeScopes.remove(&treeScope);
 }
 
@@ -170,8 +153,6 @@ void StyleEngine::updateActiveStyleSheets()
             treeScopesRemoved.add(treeScope);
     }
     m_activeTreeScopes.removeAll(treeScopesRemoved);
-
-    m_dirtyTreeScopes.clear();
 }
 
 void StyleEngine::didRemoveShadowRoot(ShadowRoot* shadowRoot)
@@ -267,14 +248,6 @@ void StyleEngine::removeFontFaceRules(const Vector<RawPtr<const StyleRuleFontFac
         m_resolver->invalidateMatchedPropertiesCache();
 }
 
-void StyleEngine::markTreeScopeDirty(TreeScope& scope)
-{
-    // TODO(esprehn): Make document not special.
-    if (scope == m_document)
-        return;
-    m_dirtyTreeScopes.add(&scope);
-}
-
 PassRefPtr<CSSStyleSheet> StyleEngine::createSheet(Element* e, const String& text)
 {
     RefPtr<CSSStyleSheet> styleSheet;
diff --git a/engine/core/dom/StyleEngine.h b/engine/core/dom/StyleEngine.h
index 24aef6d5067..88a47e8173e 100644
--- a/engine/core/dom/StyleEngine.h
+++ b/engine/core/dom/StyleEngine.h
@@ -72,7 +72,6 @@ public:
 
     const Vector<RefPtr<CSSStyleSheet>>& activeAuthorStyleSheetsFor(TreeScope&);
 
-    void modifiedStyleSheet(CSSStyleSheet*);
     void addStyleSheetCandidateNode(Node*, bool createdByParser);
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode, TreeScope&);
 
@@ -129,8 +128,6 @@ private:
     StyleSheetCollection* ensureStyleSheetCollectionFor(TreeScope&);
     StyleSheetCollection* styleSheetCollectionFor(TreeScope&);
 
-    void markTreeScopeDirty(TreeScope&);
-
     void createResolver();
 
     const StyleSheetCollection* documentStyleSheetCollection() const
@@ -152,7 +149,6 @@ private:
     StyleSheetCollectionMap m_styleSheetCollectionMap;
 
     typedef ListHashSet<TreeScope*, 16> TreeScopeSet;
-    TreeScopeSet m_dirtyTreeScopes;
     TreeScopeSet m_activeTreeScopes;
 
     bool m_ignorePendingStylesheets;