Change shadow style's scope from Shadow Host to Shadow Root

Source/core/css/SelectorChecker.h

 /*
  * 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 35 matching lines @@
     enum Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
     enum VisitedMatchType { VisitedMatchDisabled, VisitedMatchEnabled };
     enum Mode { ResolvingStyle = 0, CollectingStyleRules, CollectingCSSRules, QueryingRules, SharingRules };
     explicit SelectorChecker(Document&, Mode);
     enum BehaviorAtBoundary {
         DoesNotCrossBoundary = 0,
         // FIXME: refactor to remove BoundaryBehavior (i.e. DoesNotCrossBoundary and StaysWithinTreeScope).
         StaysWithinTreeScope = 2,
         BoundaryBehaviorMask = 3, // 2bit for boundary behavior
         ScopeContainsLastMatchedElement = 4,
-        ScopeIsShadowHost = 8,
+        ScopeIsShadowRoot = 8,
         TreatShadowHostAsNormalScope = 16,
 
-        ScopeIsShadowHostInPseudoHostParameter = ScopeIsShadowHost | TreatShadowHostAsNormalScope
+        ScopeIsShadowHostInPseudoHostParameter = ScopeIsShadowRoot | TreatShadowHostAsNormalScope
     };
 
     struct SelectorCheckingContext {
         // Initial selector constructor
         SelectorCheckingContext(const CSSSelector& selector, Element* element, VisitedMatchType visitedMatchType)
             : selector(&selector)
             , element(element)
             , previousElement(0)
             , scope(0)
             , visitedMatchType(visitedMatchType)
@@ skipping 102 matching lines @@
     AttributeConstIterator end = attributes.end();
     for (AttributeConstIterator it = attributes.begin(); it != end; ++it) {
         if (it->matches(selectorAttributeName) && (!value || it->value().impl() == value))
             return true;
     }
     return false;
 }
 
 inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, BehaviorAtBoundary behaviorAtBoundary, const ContainerNode* scope)
 {
-    if ((behaviorAtBoundary & (ScopeIsShadowHost | TreatShadowHostAsNormalScope)) == ScopeIsShadowHost)
-        return scope == element;
-    if (scope && scope->isInShadowTree())
-        return scope->shadowHost() == element;
-    return false;
+    return scope && scope->isInShadowTree() && scope->shadowHost() == element;
 }
 
 }
 
 #endif