Reviewed by Eric Seidel.

        Delete HTMLElement::checkDTD
        https://bugs.webkit.org/show_bug.cgi?id=44563

        This function existed to service the LegacyHTMLTreeBuilder.  The new
        HTMLTreeBuilder has this logic internalized.  Pulling on this thread
        caused me to remove a legacyParserAddChild and to discover some code
        that shouldn't be calling these parser-specific APIs.

        * dom/ContainerNode.cpp:
        (WebCore::ContainerNode::parserAddChild):
        (WebCore::ContainerNode::deprecatedParserAddChild):
        * dom/ContainerNode.h:
        * dom/DOMImplementation.cpp:
        (WebCore::DOMImplementation::createDocument):
        * dom/Node.cpp:
        (WebCore::Node::deprecatedParserAddChild):
        * dom/Node.h:
        * dom/XMLDocumentParser.cpp:
        (WebCore::XMLDocumentParser::enterText):
        * dom/XMLDocumentParser.h:
        * dom/XMLDocumentParserLibxml2.cpp:
        (WebCore::XMLDocumentParser::startElementNs):
        (WebCore::XMLDocumentParser::characters):
        (WebCore::XMLDocumentParser::processingInstruction):
        (WebCore::XMLDocumentParser::cdataBlock):
        (WebCore::XMLDocumentParser::comment):
        (WebCore::XMLDocumentParser::internalSubset):
        * dom/XMLDocumentParserQt.cpp:
        (WebCore::XMLDocumentParser::parse):
        (WebCore::XMLDocumentParser::parseStartElement):
        (WebCore::XMLDocumentParser::parseCharacters):
        (WebCore::XMLDocumentParser::parseProcessingInstruction):
        (WebCore::XMLDocumentParser::parseCdata):
        (WebCore::XMLDocumentParser::parseComment):
        (WebCore::XMLDocumentParser::parseDtd):
        * html/HTMLDataGridElement.cpp:
        * html/HTMLDataGridElement.h:
        * html/HTMLDataGridRowElement.cpp:
        * html/HTMLDataGridRowElement.h:
        * html/HTMLDataListElement.cpp:
        * html/HTMLDataListElement.h:
        * html/HTMLDocument.cpp:
        * html/HTMLDocument.h:
        * html/HTMLElement.cpp:
        * html/HTMLElement.h:
        * html/HTMLFieldSetElement.cpp:
        * html/HTMLFieldSetElement.h:
        * html/HTMLFrameSetElement.cpp:
        * html/HTMLFrameSetElement.h:
        * html/HTMLHeadElement.cpp:
        * html/HTMLHeadElement.h:
        * html/HTMLHeadingElement.cpp:
        * html/HTMLHeadingElement.h:
        * html/HTMLHtmlElement.cpp:
        * html/HTMLHtmlElement.h:
        * html/HTMLKeygenElement.cpp:
        (WebCore::HTMLKeygenElement::HTMLKeygenElement):
        * html/HTMLMapElement.cpp:
        * html/HTMLMapElement.h:
        * html/HTMLMediaElement.cpp:
        * html/HTMLMediaElement.h:
        * html/HTMLNoScriptElement.cpp:
        * html/HTMLNoScriptElement.h:
        * html/HTMLOptGroupElement.cpp:
        * html/HTMLOptGroupElement.h:
        * html/HTMLOptionElement.cpp:
        * html/HTMLOptionElement.h:
        * html/HTMLParagraphElement.cpp:
        * html/HTMLParagraphElement.h:
        * html/HTMLPlugInElement.cpp:
        * html/HTMLPlugInElement.h:
        * html/HTMLScriptElement.h:
        * html/HTMLSelectElement.cpp:
        * html/HTMLSelectElement.h:
        * html/HTMLStyleElement.h:
        * html/HTMLTableColElement.cpp:
        * html/HTMLTableColElement.h:
        * html/HTMLTableElement.cpp:
        * html/HTMLTableElement.h:
        * html/HTMLTableRowElement.cpp:
        * html/HTMLTableRowElement.h:
        * html/HTMLTableSectionElement.cpp:
        * html/HTMLTableSectionElement.h:
        * html/HTMLTextAreaElement.h:
        * html/HTMLTitleElement.h:
        * rendering/MediaControlElements.cpp:
        (WebCore::MediaControlElement::attachToParent):
        (WebCore::MediaControlInputElement::attachToParent):
        * rendering/TextControlInnerElements.cpp:
        (WebCore::TextControlInnerElement::attachInnerElement):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@65986 268f45cc-cd09-0410-ab3c-d52691b4dbfc