[import] The first <link rel=import> should win in the cascading order computation.

Source/core/dom/StyleSheetCandidate.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 40 matching lines @@
 }
 
 bool StyleSheetCandidate::isImport() const
 {
     return m_type == HTMLLink && toHTMLLinkElement(m_node).isImport();
 }
 
 Document* StyleSheetCandidate::importedDocument() const
 {
     ASSERT(isImport());
-    // The stylesheet update traversal shouldn't go into shared import
-    // to prevent it from stepping into cycle.
-    HTMLLinkElement& element = toHTMLLinkElement(m_node);
-    if (!element.importOwnsLoader())
-        return 0;
-    return element.import();
+    return toHTMLLinkElement(m_node).import();
 }
 
 bool StyleSheetCandidate::isAlternate() const
 {
     if (!isElement())
         return false;
     return toElement(m_node).getAttribute(relAttr).contains("alternate");
 }
 
 bool StyleSheetCandidate::isEnabledViaScript() const
@@ skipping 59 matching lines @@
         return toSVGStyleElement(m_node).sheet();
     case Pi:
         return toProcessingInstruction(m_node).sheet();
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 }