Reviewed by David Hyatt.

WebCore:

        No tests since there is no change in behavior.

        HTMLParserQuirks.h defines an abstract base class that may be
        extended as needed.  The ChromeClient::createHTMLParserQuirks()
        factory method should be used to return an HTMLParserQuirks
        subclassed object when needed.

        * WebCore.xcodeproj/project.pbxproj: Added HTMLParserQuirks.h.
        * html/HTMLParser.cpp:
        (WebCore::HTMLParser::HTMLParser): Initialize m_parserQuirks
        using ChromeClient::createHTMLParserQuirks().
        (WebCore::HTMLParser::~HTMLParser): Delete m_parserQuirks if
        set.
        (WebCore::HTMLParser::reset): Call HTMLParserQuirks::reset() if
        m_parserQuirks is set.
        (WebCore::HTMLParser::insertNode): Call
        HTMLParserQuirks::shouldInsertNode() if m_parserQuirks is set,
        and return early if it returns false.
        (WebCore::HTMLParser::popBlock): Call
        HTMLParserQuirks::shouldPopBlock() if m_parserQuirks is set, and
        return early if it returns false.
        * html/HTMLParser.h: Added m_parserQuirks.
        * html/HTMLParserQuirks.h: Added.
        (WebCore::HTMLParserQuirks::HTMLParserQuirks):
        (WebCore::HTMLParserQuirks::~HTMLParserQuirks):
        * loader/EmptyClients.h:
        (WebCore::EmptyChromeClient::createHTMLParserQuirks): Added.
        * page/ChromeClient.h:
        (WebCore::ChromeClient::createHTMLParserQuirks): Added.

WebKit/gtk:

        * WebCoreSupport/ChromeClientGtk.h:
        (WebKit::ChromeClient::createHTMLParserQuirks): Added.  The
        default implementation of this factory method returns 0.

WebKit/mac:

        * WebCoreSupport/WebChromeClient.h:
        (WebChromeClient::createHTMLParserQuirks): Added.  The default
        implementation of this factory method returns 0.

WebKit/qt:

        * WebCoreSupport/ChromeClientQt.h:
        (WebCore::ChromeClientQt::createHTMLParserQuirks): Added.  The
        default implementation of this factory method returns 0.

WebKit/win:

        * WebCoreSupport/WebChromeClient.h:
        (WebChromeClient::createHTMLParserQuirks): Added.  The default
        implementation of this factory method returns 0.

WebKit/wx:

        * WebKitSupport/ChromeClientWx.h:
        (WebCore::ChromeClientWx::createHTMLParserQuirks): Added.  The
        default implementation of this factory method returns 0.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43092 268f45cc-cd09-0410-ab3c-d52691b4dbfc