Simplified code for styleResolverChanged.

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 69 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)
+void ShadowTreeStyleSheetCollection::updateActiveStyleSheets(StyleEngine* engine, StyleResolverUpdateMode updateMode)
 {
     StyleSheetCollection collection;
     collectStyleSheets(engine, collection);
 
     StyleSheetChange change;
     analyzeStyleSheetChange(updateMode, collection, change);
 
     if (StyleResolver* styleResolver = engine->resolver()) {
         // 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(SubtreeStyleChange);
 
     m_scopingNodesForStyleScoped.didRemoveScopingNodes();
     collection.swap(*this);
     updateUsesRemUnits();
-
-    return change.requiresFullStyleRecalc;
 }
 
 }