Reviewed by Adam Barth.

        Use plug-in DB for extensions to MIME type convertion

        Plugins extension to MIME type conversion was not used in the
        frameLoader. This was causing some fallback to be use which as the side
        effect of loosing all the <OBJECT> parameters or <EMBED> attributes.
        This patch ensure that we try to convert the extension to MIME type
        using the plugin database beofre using this fallback.

        Attribute lost with Flash plugin without mime type set
        https://bugs.webkit.org/show_bug.cgi?id=50657

        * plugins/no-mime-with-valid-extension.html: Added.
        * plugins/no-mime-with-valid-extension-expected.txt: Added.
2011-01-11  Nicolas Dufresne  <nicolas.dufresne@collabora.co.uk>

        Reviewed by Adam Barth.

        Use plug-in DB for extensions to MIME type convertion

        Plugins extension to MIME type conversion was not used in the
        frameLoader. This was causing some fallback to be use which as the side
        effect of loosing all the <OBJECT> parameters or <EMBED> attributes.
        This patch ensure that we try to convert the extension to MIME type
        using the plugin database beofre using this fallback.

        Attribute lost with Flash plugin without mime type set
        https://bugs.webkit.org/show_bug.cgi?id=50657

        Test: plugins/no-mime-with-valid-extension.html

        * loader/FrameLoader.cpp:
        (WebCore::FrameLoader::defaultObjectContentType): Use PluginDatabase for MIME

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75567 268f45cc-cd09-0410-ab3c-d52691b4dbfc