Remove single client special cases for StyleSheetContents.

sky/engine/core/css/resolver/ScopedStyleResolver.cpp

 /*
  * 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) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 37 matching lines @@
     AddRuleFlags addRuleFlags = RuleHasNoSpecialState;
     const RuleSet& ruleSet = sheet->ensureRuleSet(medium, addRuleFlags);
     resolver->addMediaQueryResults(ruleSet.viewportDependentMediaQueryResults());
     resolver->processScopedRules(ruleSet, cssSheet, index, treeScope().rootNode());
 }
 
 void ScopedStyleResolver::collectFeaturesTo(RuleFeatureSet& features, HashSet<const StyleSheetContents*>& visitedSharedStyleSheetContents) const
 {
     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) {
         StyleSheetContents* contents = m_authorStyleSheets[i]->contents();
-        if (contents->hasOneClient() || visitedSharedStyleSheetContents.add(contents).isNewEntry)
+        if (visitedSharedStyleSheetContents.add(contents).isNewEntry)
             features.add(contents->ruleSet().features());
     }
 }
 
 void ScopedStyleResolver::resetAuthorStyle()
 {
     m_authorStyleSheets.clear();
     m_keyframesRuleMap.clear();
 }
 
@@ skipping 31 matching lines @@
         contextFlags |= SelectorChecker::ScopeContainsLastMatchedElement;
 
     RuleRange ruleRange = collector.matchedResult().ranges.authorRuleRange();
     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) {
         MatchRequest matchRequest(&m_authorStyleSheets[i]->contents()->ruleSet(), includeEmptyRules, &m_scope->rootNode(), m_authorStyleSheets[i], applyAuthorStyles, i);
         collector.collectMatchingRules(matchRequest, ruleRange, static_cast<SelectorChecker::ContextFlags>(contextFlags), cascadeScope, cascadeOrder);
     }
 }
 
 } // namespace blink