Remove SelectorChecker::ContextFlags.

sky/engine/core/css/SelectorChecker.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 46 matching lines @@
     // if the last matched element is a shadow host, the condition above isn't met, even though it
     // should be.
     return context.element == context.scope->shadowHost();
 }
 
 bool SelectorChecker::match(const SelectorCheckingContext& context) const
 {
     // FIXME(sky): Get rid of SelectorCheckingContext.
     SelectorCheckingContext matchContext(context);
 
-    bool isShadowHost = isHostInItsShadowTree(*context.element, context.scope)
-        && !(context.contextFlags & TreatShadowHostAsNormalScope);
+    bool isShadowHost = isHostInItsShadowTree(*context.element, context.scope);
 
     while (true) {
         const CSSSelector& selector = *matchContext.selector;
         // Only :host and :host-context() should match the host:
         // http://drafts.csswg.org/css-scoping/#host-element
         if (isShadowHost && !selector.isHostPseudoClass())
             return false;
         if (!checkOne(matchContext))
             return false;
         if (selector.isLastInTagHistory())
@@ skipping 201 matching lines @@
             const ContainerNode* shadowHost = context.scope->shadowHost();
             if (!shadowHost || shadowHost != element)
                 return false;
             ASSERT(element.shadow());
 
             // For empty parameter case, i.e. just :host or :host().
             if (!selector.selectorList())
                 return true;
 
             SelectorCheckingContext subContext(context);
-            subContext.contextFlags = TreatShadowHostAsNormalScope;
+
+            // Treat the inside of :host() rules as if they were defined in the
+            // same scope as the host.
+            subContext.scope = &context.element->treeScope().rootNode();
 
             for (subContext.selector = selector.selectorList()->first(); subContext.selector; subContext.selector = CSSSelectorList::next(*subContext.selector)) {
                 if (match(subContext))
                     return true;
             }
             return false;
         }
 
     case CSSSelector::PseudoUnknown:
     case CSSSelector::PseudoNotParsed:
@@ skipping 10 matching lines @@
         return false;
     LocalFrame* frame = element.document().frame();
     if (!frame)
         return false;
     if (!frame->selection().isFocusedAndActive())
         return false;
     return true;
 }
 
 }