Move rem handling out of CSSParserValues.cpp

Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 317 matching lines @@
                 updateActiveStyleSheetsInShadow(updateMode, treeScope, treeScopesRemoved);
         } else {
             for (TreeScope* treeScope : m_dirtyTreeScopes)
                 updateActiveStyleSheetsInShadow(updateMode, treeScope, treeScopesRemoved);
         }
         for (TreeScope* treeScope : treeScopesRemoved)
             m_activeTreeScopes.remove(treeScope);
     }
 
     InspectorInstrumentation::activeStyleSheetsUpdated(m_document);
-    m_usesRemUnits = documentStyleSheetCollection()->usesRemUnits();
 
     m_dirtyTreeScopes.clear();
     m_documentScopeDirty = false;
 }
 
 const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>> StyleEngine::activeStyleSheetsForInspector() const
 {
     if (m_activeTreeScopes.isEmpty())
         return documentStyleSheetCollection()->activeAuthorStyleSheets();
 
@@ skipping 373 matching lines @@
     visitor->trace(m_dirtyTreeScopes);
     visitor->trace(m_activeTreeScopes);
     visitor->trace(m_fontSelector);
     visitor->trace(m_textToSheetCache);
     visitor->trace(m_sheetToTextCache);
 #endif
     CSSFontSelectorClient::trace(visitor);
 }
 
 }