Missing return after class invalidation short-cut.

Source/core/css/RuleFeature.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 428 matching lines @@
 void RuleFeatureSet::scheduleStyleInvalidationForClassChange(const SpaceSplitString& changedClasses, Element& element)
 {
     unsigned changedSize = changedClasses.size();
     for (unsigned i = 0; i < changedSize; ++i) {
         addClassToInvalidationSet(changedClasses[i], element);
     }
 }
 
 void RuleFeatureSet::scheduleStyleInvalidationForClassChange(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses, Element& element)
 {
-    if (!oldClasses.size())
+    if (!oldClasses.size()) {
         scheduleStyleInvalidationForClassChange(newClasses, element);
+        return;
+    }
 
     // Class vectors tend to be very short. This is faster than using a hash table.
     BitVector remainingClassBits;
     remainingClassBits.ensureSize(oldClasses.size());
 
     for (unsigned i = 0; i < newClasses.size(); ++i) {
         bool found = false;
         for (unsigned j = 0; j < oldClasses.size(); ++j) {
             if (newClasses[i] == oldClasses[j]) {
                 // Mark each class that is still in the newClasses so we can skip doing
@@ skipping 57 matching lines @@
     visitor->trace(siblingRules);
     visitor->trace(uncommonAttributeRules);
     visitor->trace(m_classInvalidationSets);
     visitor->trace(m_attributeInvalidationSets);
     visitor->trace(m_idInvalidationSets);
     visitor->trace(m_pseudoInvalidationSets);
     visitor->trace(m_styleInvalidator);
 }
 
 } // namespace WebCore