Call ContainerNode::checkForSiblingStyleChanges() for Element insertion / removal only

Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 190 matching lines @@
         m_registeredWithParentShadowRoot = false;
     }
 
     DocumentFragment::removedFrom(insertionPoint);
 }
 
 void ShadowRoot::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
 
-    checkForSiblingStyleChanges(change.type == ChildRemoved ? SiblingRemoved : Other, change.siblingBeforeChange, change.siblingAfterChange);
+    if (change.isChildElementChange())
+        checkForSiblingStyleChanges(change.type == ElementRemoved ? SiblingElementRemoved : SiblingElementInserted, change.siblingBeforeChange, change.siblingAfterChange);
 
     if (InsertionPoint* point = shadowInsertionPointOfYoungerShadowRoot()) {
         if (ShadowRoot* root = point->containingShadowRoot())
             root->owner()->setNeedsDistributionRecalc();
     }
 }
 
 void ShadowRoot::registerScopedHTMLStyleChild()
 {
     ++m_numberOfStyles;
@@ skipping 113 matching lines @@
 void ShadowRoot::trace(Visitor* visitor)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 }