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        Reviewed by Maciej Stachowiak.

        Correctly get a plug-in's MIME type when it uses WebPluginMIMETypesFilename
        https://bugs.webkit.org/show_bug.cgi?id=57205
        
        If the plug-in's Info.plist uses WebPluginMIMETypesFilename to specify
        plug-in MIME types, WebKit has to check for a property list file in
        ~/Library/Preferences for the MIME type dictionary.

        * Shared/Plugins/Netscape/mac/NetscapePluginModuleMac.mm:
        (WebKit::getMIMETypesFromPluginBundle): If the bundle's Info dictionary
        has the key WebPluginMIMETypesFilename, open the property list
        specified by that key's value and return the MIME type dictionary from
        there. Otherwise, return the MIME type dictionary specified by the key
        WebPluginMIMETypes.
        (WebKit::getPluginInfoFromPropertyLists): Call
        getMIMETypesFromPluginBundle().


git-svn-id: svn://svn.chromium.org/blink/trunk@82087 bbb929c8-8fbe-4397-9dbb-9b2b20218538