Revert 78101 - Merge r76728, crbug 68263

WebCore/xml/XSLStyleSheetLibxslt.cpp

Index: WebCore/xml/XSLStyleSheetLibxslt.cpp
===================================================================
--- WebCore/xml/XSLStyleSheetLibxslt.cpp	(revision 78365)
+++ WebCore/xml/XSLStyleSheetLibxslt.cpp	(working copy)
@@ -57,6 +57,7 @@
 
 XSLStyleSheet::XSLStyleSheet(XSLImportRule* parentRule, const String& originalURL, const KURL& finalURL)
     : StyleSheet(parentRule, originalURL, finalURL)
+    , m_ownerDocument(0)
     , m_embedded(false)
     , m_processed(false) // Child sheets get marked as processed when the libxslt engine has finally seen them.
     , m_stylesheetDoc(0)
@@ -67,6 +68,7 @@
 
 XSLStyleSheet::XSLStyleSheet(Node* parentNode, const String& originalURL, const KURL& finalURL,  bool embedded)
     : StyleSheet(parentNode, originalURL, finalURL)
+    , m_ownerDocument(parentNode->document())
     , m_embedded(embedded)
     , m_processed(true) // The root sheet starts off processed.
     , m_stylesheetDoc(0)
@@ -128,10 +130,9 @@
 
 CachedResourceLoader* XSLStyleSheet::cachedResourceLoader()
 {
-    Document* document = ownerDocument();
-    if (!document)
+    if (!m_ownerDocument)
         return 0;
-    return document->cachedResourceLoader();
+    return m_ownerDocument->cachedResourceLoader();
 }
 
 bool XSLStyleSheet::parseString(const String& string, bool)
@@ -257,18 +258,10 @@
 void XSLStyleSheet::setParentStyleSheet(XSLStyleSheet* parent)
 {
     m_parentStyleSheet = parent;
+    if (parent)
+        m_ownerDocument = parent->ownerDocument();
 }
 
-Document* XSLStyleSheet::ownerDocument()
-{
-    for (XSLStyleSheet* styleSheet = this; styleSheet; styleSheet = styleSheet->parentStyleSheet()) {
-        Node* node = styleSheet->ownerNode();
-        if (node)
-            return node->document();
-    }
-    return 0;
-}
-
 xmlDocPtr XSLStyleSheet::locateStylesheetSubResource(xmlDocPtr parentDoc, const xmlChar* uri)
 {
     bool matchedParent = (parentDoc == document());