Defer iframe JavaScript URL evaluation

Source/core/dom/StyleElement.cpp

 /*
  * Copyright (C) 2006, 2007 Rob Buis
  * Copyright (C) 2008 Apple, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 42 matching lines @@
 StyleElement::~StyleElement()
 {
     if (m_sheet)
         clearSheet();
 }
 
 void StyleElement::processStyleSheet(Document& document, Element* element)
 {
     TRACE_EVENT0("webkit", "StyleElement::processStyleSheet");
     ASSERT(element);
+    ASSERT(element->inDocument());
 
     m_registeredAsCandidate = true;
     document.styleEngine()->addStyleSheetCandidateNode(element, m_createdByParser);
     if (m_createdByParser)
         return;
 
     process(element);
 }
 
 void StyleElement::removedFromDocument(Document& document, Element* element)
 {
     removedFromDocument(document, element, 0, document);
 }
 
 void StyleElement::removedFromDocument(Document& document, Element* element, ContainerNode* scopingNode, TreeScope& treeScope)
 {
     ASSERT(element);
 
-    if (!m_registeredAsCandidate) {
-        ASSERT(!m_sheet);
-        return;
+    if (m_registeredAsCandidate) {
+        document.styleEngine()->removeStyleSheetCandidateNode(element, scopingNode, treeScope);
+        m_registeredAsCandidate = false;
     }
 
-    document.styleEngine()->removeStyleSheetCandidateNode(element, scopingNode, treeScope);
-    m_registeredAsCandidate = false;
-
     RefPtrWillBeRawPtr<StyleSheet> removedSheet = m_sheet.get();
 
     if (m_sheet)
         clearSheet(element);
-
-    document.removedStyleSheet(removedSheet.get(), RecalcStyleDeferred, AnalyzedStyleUpdate);
+    if (removedSheet)
+        document.removedStyleSheet(removedSheet.get(), RecalcStyleDeferred, AnalyzedStyleUpdate);
 }
 
 void StyleElement::clearDocumentData(Document& document, Element* element)
 {
     if (m_sheet)
         m_sheet->clearOwnerNode();
 
     if (element->inDocument()) {
         ContainerNode* scopingNode = isHTMLStyleElement(element) ? toHTMLStyleElement(element)->scopingNode() :  0;
         TreeScope& treeScope = scopingNode ? scopingNode->treeScope() : element->treeScope();
@@ skipping 78 matching lines @@
     document.styleEngine()->removePendingSheet(m_sheet->ownerNode());
     return true;
 }
 
 void StyleElement::startLoadingDynamicSheet(Document& document)
 {
     document.styleEngine()->addPendingSheet();
 }
 
 }