Don't scope check in SelectorChecker.

sky/engine/core/css/resolver/MatchRequest.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 10 matching lines @@
  */
 
 #ifndef SKY_ENGINE_CORE_CSS_RESOLVER_MATCHREQUEST_H_
 #define SKY_ENGINE_CORE_CSS_RESOLVER_MATCHREQUEST_H_
 
 #include "sky/engine/core/css/CSSStyleSheet.h"
 #include "sky/engine/core/css/RuleSet.h"
 
 namespace blink {
 
-class ContainerNode;
-
 class MatchRequest {
     STACK_ALLOCATED();
 public:
-    MatchRequest(RuleSet* ruleSet, const ContainerNode* scope = 0, const CSSStyleSheet* cssSheet = 0, unsigned styleSheetIndex = 0)
+    MatchRequest(RuleSet* ruleSet, const CSSStyleSheet* cssSheet = 0, unsigned styleSheetIndex = 0)
         : ruleSet(ruleSet)
-        , scope(scope)
         , styleSheet(cssSheet)
         , styleSheetIndex(styleSheetIndex)
     {
         // Now that we're about to read from the RuleSet, we're done adding more
         // rules to the set and we should make sure it's compacted.
         ruleSet->compactRulesIfNeeded();
     }
 
     RawPtr<const RuleSet> ruleSet;
-    RawPtr<const ContainerNode> scope;
     RawPtr<const CSSStyleSheet> styleSheet;
     const unsigned styleSheetIndex;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_CSS_RESOLVER_MATCHREQUEST_H_