Avoid parsing css text if there are identical inline style blocks.

Source/core/dom/ProcessingInstruction.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006, 2008, 2009 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 203 matching lines @@
     else if (m_isXSL)
         toXSLStyleSheet(m_sheet.get())->parseString(sheet);
 
     if (m_resource)
         m_resource->removeClient(this);
     m_resource = 0;
 
     m_loading = false;
 
     if (m_isCSS)
-        toCSSStyleSheet(m_sheet.get())->contents()->checkLoaded();
+        toCSSStyleSheet(m_sheet.get())->contents()->checkLoadedFor(m_sheet->ownerNode());
     else if (m_isXSL)
         toXSLStyleSheet(m_sheet.get())->checkLoaded();
 }
 
 void ProcessingInstruction::setCSSStyleSheet(PassRefPtr<CSSStyleSheet> sheet)
 {
     ASSERT(!m_resource);
     ASSERT(!m_loading);
     m_sheet = sheet;
     sheet->setTitle(m_title);
@@ skipping 39 matching lines @@
         document().removedStyleSheet(removedSheet.get());
 }
 
 void ProcessingInstruction::finishParsingChildren()
 {
     m_createdByParser = false;
     CharacterData::finishParsingChildren();
 }
 
 } // namespace