Remove useless calls to DOMImplementation::hasFeature("XML", String())

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 1136 matching lines @@
     if (m_contentLanguage == language)
         return;
     m_contentLanguage = language;
 
     // Document's style depends on the content language.
     setNeedsStyleRecalc(SubtreeStyleChange);
 }
 
 void Document::setXMLVersion(const String& version, ExceptionState& exceptionState)
 {
-    if (!implementation().hasFeature("XML", String())) {
-        exceptionState.throwDOMException(NotSupportedError, "This document does not support XML.");
-        return;
-    }
-
     if (!XMLDocumentParser::supportsXMLVersion(version)) {
         exceptionState.throwDOMException(NotSupportedError, "This document does not support the XML version '" + version + "'.");
         return;
     }
 
     m_xmlVersion = version;
 }
 
 void Document::setXMLStandalone(bool standalone, ExceptionState& exceptionState)
 {
-    if (!implementation().hasFeature("XML", String())) {
-        exceptionState.throwDOMException(NotSupportedError, "This document does not support XML.");
-        return;
-    }
-
     m_xmlStandalone = standalone ? Standalone : NotStandalone;
 }
 
 KURL Document::baseURI() const
 {
     return m_baseURL;
 }
 
 void Document::setContent(const String& content)
 {
@@ skipping 4412 matching lines @@
         (*it)->invalidateCache(attrName);
 }
 
 void Document::trace(Visitor* visitor)
 {
     Supplementable<Document>::trace(visitor);
     ContainerNode::trace(visitor);
 }
 
 } // namespace WebCore