Remove ScopedStyleResolver::treeScopeFor.

Source/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 28 matching lines @@
 #include "core/css/resolver/ViewportStyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/svg/SVGStyleElement.h"
 
 namespace blink {
 
-TreeScope* ScopedStyleResolver::treeScopeFor(Document& document, const CSSStyleSheet* sheet)
-{
-    ASSERT(sheet);
-
-    if (!sheet->ownerDocument())
-        return 0;
-
-    Node* ownerNode = sheet->ownerNode();
-    if (!isHTMLStyleElement(ownerNode) && !isSVGStyleElement(ownerNode))
-        return &document;
-
-    Element& styleElement = toElement(*ownerNode);
-    if (styleElement.isInShadowTree())
-        return styleElement.containingShadowRoot();
-    return &document;
-}
-
 ScopedStyleResolver* ScopedStyleResolver::parent() const
 {
     for (TreeScope* scope = treeScope().parentTreeScope(); scope; scope = scope->parentTreeScope()) {
         if (ScopedStyleResolver* resolver = scope->scopedStyleResolver())
             return resolver;
     }
     return 0;
 }
 
 void ScopedStyleResolver::addKeyframeRules(const RuleSet& ruleSet)
@@ skipping 170 matching lines @@
     m_treeBoundaryCrossingRuleSet->append(RuleSubSet::create(parentStyleSheet, sheetIndex, ruleSetForScope.release()));
 }
 
 DEFINE_TRACE(ScopedStyleResolver::RuleSubSet)
 {
     visitor->trace(m_parentStyleSheet);
     visitor->trace(m_ruleSet);
 }
 
 } // namespace blink