Get rid of Reset and ResetStyleResolverAndFontSelector.

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)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 72 matching lines @@
         if (rel.contains("alternate") && title.isEmpty())
             activeSheet = 0;
 
         if (sheet)
             collection.appendSheetForList(sheet);
         if (activeSheet)
             collection.appendActiveStyleSheet(activeSheet);
     }
 }
 
-bool ShadowTreeStyleSheetCollection::updateActiveStyleSheets(StyleEngine* engine, StyleResolverUpdateMode updateMode)
-{
-    StyleSheetCollectionBase collection;
-    collectStyleSheets(engine, collection);
-
-    StyleSheetChange change;
-    analyzeStyleSheetChange(updateMode, collection, change);
-
-    if (StyleResolver* styleResolver = engine->resolverIfExists()) {
-        // FIXME: We might have already had styles in child treescope. In this case, we cannot use buildScopedStyleTreeInDocumentOrder.
-        // Need to change "false" to some valid condition.
-        styleResolver->setBuildScopedStyleTreeInDocumentOrder(false);
-        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.
-            resetAllRuleSetsInTreeScope(styleResolver);
-            styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
-            styleResolver->lazyAppendAuthorStyleSheets(0, collection.activeAuthorStyleSheets());
-        } else {
-            styleResolver->lazyAppendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), collection.activeAuthorStyleSheets());
-        }
-    }
-    if (change.requiresFullStyleRecalc)
-        toShadowRoot(m_treeScope.rootNode())->host()->setNeedsStyleRecalc();
-
-    m_scopingNodesForStyleScoped.didRemoveScopingNodes();
-    collection.swap(*this);
-    updateUsesRemUnits();
-
-    return change.requiresFullStyleRecalc;
 }
-
-}