Clean up code duplication of isAtShadowBoundary()

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 508 matching lines @@
     documentStyle->setZoom(frame && !document.printing() ? frame->pageZoomFactor() : 1);
     documentStyle->setLocale(document.contentLanguage());
     documentStyle->setZIndex(0);
     documentStyle->setUserModify(document.inDesignMode() ? READ_WRITE : READ_ONLY);
 
     document.setupFontBuilder(documentStyle.get());
 
     return documentStyle.release();
 }
 
-// FIXME: This is duplicated with StyleAdjuster.cpp
-// Perhaps this should move onto ElementResolveContext or even Element?
-static inline bool isAtShadowBoundary(const Element* element)
-{
-    if (!element)
-        return false;
-    ContainerNode* parentNode = element->parentNode();
-    return parentNode && parentNode->isShadowRoot();
-}
-
 static inline void resetDirectionAndWritingModeOnDocument(Document& document)
 {
     document.setDirectionSetOnDocumentElement(false);
     document.setWritingModeSetOnDocumentElement(false);
 }
 
 static void addContentAttrValuesToFeatures(const Vector<AtomicString>& contentAttrValues, RuleFeatureSet& features)
 {
     for (size_t i = 0; i < contentAttrValues.size(); ++i)
         features.addContentAttr(contentAttrValues[i]);
@@ skipping 1054 matching lines @@
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 #endif
 }
 
 } // namespace blink