Move TreeBoundaryCrossingScopes to StyleEngine.

third_party/WebKit/Source/core/dom/ShadowTreeStyleSheetCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 61 matching lines @@
 
   StyleSheetChange change;
   analyzeStyleSheetChange(updateMode, collection->activeAuthorStyleSheets(),
                           change);
 
   if (StyleResolver* styleResolver = engine.resolver()) {
     if (change.styleResolverUpdateType != Additive) {
       // We should not destroy StyleResolver when we find any stylesheet update
       // in a shadow tree.  In this case, we will reset rulesets created from
       // style elements in the shadow tree.
-      styleResolver->resetAuthorStyle(treeScope());
+      engine.resetAuthorStyle(treeScope());
       styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
       styleResolver->lazyAppendAuthorStyleSheets(
           0, collection->activeAuthorStyleSheets());
     } else {
       styleResolver->lazyAppendAuthorStyleSheets(
           m_activeAuthorStyleSheets.size(),
           collection->activeAuthorStyleSheets());
     }
   }
   if (change.requiresFullStyleRecalc)
     toShadowRoot(treeScope().rootNode())
         .host()
         .setNeedsStyleRecalc(SubtreeStyleChange,
                              StyleChangeReasonForTracing::create(
                                  StyleChangeReason::ActiveStylesheetsUpdate));
 
   collection->swap(*this);
   collection->dispose();
 }
 
 }  // namespace blink