Clean up code duplication of isAtShadowBoundary()

Source/core/css/resolver/StyleAdjuster.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 38 matching lines @@
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "core/svg/SVGSVGElement.h"
 #include "platform/Length.h"
 #include "platform/transforms/TransformOperations.h"
 #include "wtf/Assertions.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
-// FIXME: This is duplicated with StyleResolver.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 EDisplay equivalentBlockDisplay(EDisplay display, bool isFloating, bool strictParsing)
 {
     switch (display) {
     case BLOCK:
     case TABLE:
     case BOX:
     case FLEX:
     case GRID:
         return display;
 
@@ skipping 380 matching lines @@
     if (style->writingMode() != TopToBottomWritingMode && (style->display() == BOX || style->display() == INLINE_BOX))
         style->setWritingMode(TopToBottomWritingMode);
 
     if (parentStyle->isDisplayFlexibleOrGridBox()) {
         style->setFloating(NoFloat);
         style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !m_useQuirksModeStyles));
     }
 }
 
 }