Get rid of Reset and ResetStyleResolverAndFontSelector.

Source/core/dom/StyleEngine.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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 329 matching lines @@
 
     if (shouldUpdateShadowTreeStyleSheetCollection(updateMode)) {
         TreeScopeSet treeScopes = updateMode == FullStyleUpdate ? m_activeTreeScopes : m_dirtyTreeScopes.subscope();
         HashSet<TreeScope*> treeScopesRemoved;
 
         for (TreeScopeSet::iterator it = treeScopes.begin(); it != treeScopes.end(); ++it) {
             TreeScope* treeScope = *it;
             ASSERT(treeScope != m_document);
             ShadowTreeStyleSheetCollection* collection = static_cast<ShadowTreeStyleSheetCollection*>(styleSheetCollectionFor(*treeScope));
             ASSERT(collection);
-            collection->updateActiveStyleSheets(this, updateMode);
+            if (collection->updateActiveStyleSheets(this, updateMode))
+                toShadowRoot(treeScope->rootNode())->host()->setNeedsStyleRecalc();
             if (!collection->hasStyleSheetCandidateNodes())
                 treeScopesRemoved.add(treeScope);
         }
         if (!treeScopesRemoved.isEmpty())
             for (HashSet<TreeScope*>::iterator it = treeScopesRemoved.begin(); it != treeScopesRemoved.end(); ++it)
                 m_activeTreeScopes.remove(*it);
     }
     m_needsUpdateActiveStylesheetsOnStyleRecalc = false;
     activeStyleSheetsUpdatedForInspector();
     m_usesRemUnits = m_documentStyleSheetCollection.usesRemUnits();
@@ skipping 119 matching lines @@
     if (m_document.didLayoutWithPendingStylesheets() && !hasPendingSheets())
         change.setNeedsRepaint();
 
     if (updateActiveStyleSheets(mode))
         change.setNeedsStyleRecalc();
 
     return change;
 }
 
 }