Let Node.textContent never throw

Source/core/dom/Document.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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 3963 matching lines @@
     // in the title bar.
     if (m_titleElement
         && encoding() != newData.encoding
         && !m_titleElement->firstElementChild()
         && encoding() == Latin1Encoding()
         && m_titleElement->textContent().containsOnlyLatin1()) {
 
         CString originalBytes = m_titleElement->textContent().latin1();
         OwnPtr<TextCodec> codec = newTextCodec(newData.encoding);
         String correctlyDecodedTitle = codec->decode(originalBytes.data(), originalBytes.length(), true);
-        m_titleElement->setTextContent(correctlyDecodedTitle, IGNORE_EXCEPTION);
+        m_titleElement->setTextContent(correctlyDecodedTitle);
     }
 
     m_encodingData = newData;
 }
 
 KURL Document::completeURL(const String& url, const KURL& baseURLOverride) const
 {
     // Always return a null URL when passed a null string.
     // FIXME: Should we change the KURL constructor to have this behavior?
     // See also [CSS]StyleSheet::completeURL(const String&)
@@ skipping 1236 matching lines @@
 }
 
 FastTextAutosizer* Document::fastTextAutosizer()
 {
     if (!m_fastTextAutosizer && RuntimeEnabledFeatures::fastTextAutosizingEnabled())
         m_fastTextAutosizer = FastTextAutosizer::create(this);
     return m_fastTextAutosizer.get();
 }
 
 } // namespace WebCore