Make textContent trigger single DOMSubtreeModified event

Source/core/html/HTMLTitleElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 67 matching lines @@
     return result.toString();
 }
 
 void HTMLTitleElement::setText(const String &value)
 {
     RefPtrWillBeRawPtr<Node> protectFromMutationEvents(this);
     ChildListMutationScope mutation(*this);
 
     // Avoid calling Document::setTitleElement() during intermediate steps.
     m_ignoreTitleUpdatesWhenChildrenChange = !value.isEmpty();
-    removeChildren();
+    removeChildren(OmitSubtreeModifiedEvent);
     m_ignoreTitleUpdatesWhenChildrenChange = false;
 
     if (!value.isEmpty())
         appendChild(document().createTextNode(value.impl()), IGNORE_EXCEPTION);
 }
 
 }