Let Node.textContent never throw

Source/core/dom/Node.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) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1576 matching lines @@
 }
 
 String Node::textContent(bool convertBRsToNewlines) const
 {
     StringBuilder content;
     bool isNullString = true;
     appendTextContent(this, convertBRsToNewlines, isNullString, content);
     return isNullString ? String() : content.toString();
 }
 
-void Node::setTextContent(const String& text, ExceptionState& exceptionState)
+void Node::setTextContent(const String& text)
 {
     switch (nodeType()) {
         case TEXT_NODE:
         case CDATA_SECTION_NODE:
         case COMMENT_NODE:
         case PROCESSING_INSTRUCTION_NODE:
             setNodeValue(text);
             return;
         case ELEMENT_NODE:
         case ATTRIBUTE_NODE:
         case ENTITY_NODE:
         case DOCUMENT_FRAGMENT_NODE: {
             RefPtr<ContainerNode> container = toContainerNode(this);
             ChildListMutationScope mutation(*this);
             container->removeChildren();
             if (!text.isEmpty())
-                container->appendChild(document().createTextNode(text), exceptionState);
+                container->appendChild(document().createTextNode(text), ASSERT_NO_EXCEPTION);
             return;
         }
         case DOCUMENT_NODE:
         case DOCUMENT_TYPE_NODE:
         case NOTATION_NODE:
         case XPATH_NAMESPACE_NODE:
             // Do nothing.
             return;
     }
     ASSERT_NOT_REACHED();
@@ skipping 1045 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif