Reviewed by Alexey Proskuryakov.

        Bug 23940: Use Document::createElement(const QualifiedName&, bool) when creating a known element inside WebCore

        Document::createElement(const QualifiedName&, bool) does not check for the prefix as opposed the the one taking an AtomicString
        or Document::createElementNS. This is perfectly fine internally because we know the type of element created and the check is
        unneeded.

        It also removes the use of an ExceptionCode argument which was here only to check that the prefix check was fine. Finally it
        enables us to use some generated QualifiedName.

        * bindings/js/JSOptionConstructor.cpp:
        (WebCore::constructHTMLOptionElement):
        * dom/Document.cpp:
        (WebCore::Document::setTitle):
        * dom/XMLTokenizer.cpp:
        (WebCore::createXHTMLParserErrorHeader):
        (WebCore::XMLTokenizer::insertErrorMessageBlock):
        * editing/CompositeEditCommand.cpp:
        (WebCore::createBlockPlaceholderElement):
        * editing/htmlediting.cpp:
        (WebCore::createTabSpanElement):
        * html/HTMLSelectElement.cpp:
        (WebCore::HTMLSelectElement::setLength):
        * loader/FTPDirectoryDocument.cpp:
        (WebCore::FTPDirectoryTokenizer::appendEntry):
        (WebCore::FTPDirectoryTokenizer::createTDForFilename):
        (WebCore::FTPDirectoryTokenizer::loadDocumentTemplate):
        (WebCore::FTPDirectoryTokenizer::createBasicDocument):
        * loader/ImageDocument.cpp:
        (WebCore::ImageDocument::createDocumentStructure):
        * loader/MediaDocument.cpp:
        (WebCore::MediaTokenizer::createDocumentStructure):
        * loader/PluginDocument.cpp:
        (WebCore::PluginTokenizer::createDocumentStructure):
        * loader/TextDocument.cpp:
        (WebCore::TextTokenizer::write):
        * page/Frame.cpp:
        (WebCore::Frame::selectionComputedStyle):
        (WebCore::Frame::styleForSelectionStart):
        Document::createElement(const AtomicString&, ...) to Document::createElement(const QualifiedName&, ...) switch.

        * xml/XPathFunctions.cpp:
        (WebCore::XPath::FunLang::evaluate): Re-use langAttr instead of creating a new attribute.
        * page/DragController.cpp:
        (WebCore::documentFragmentFromDragData): Use the HTMLAnchorElement directly to get rid of the static cast.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41120 268f45cc-cd09-0410-ab3c-d52691b4dbfc