Fixed: <rdar://problem/4610818> CrashTracer: 1533 crashes in Safari at com.macromedia.Flash Player.plugin: native_ShockwaveFlash_TCallLabel + 271131

        The problem was that some Leopard users were still inadvertently using the old Flash 8 plug-in, even though Leopard
        shipped with Flash 9. To avoid loading an older version of a plug-in when a newer version is installed, the plug-in
        database will compare bundle versions and always load the latest version.

        * Plugins/WebBasePluginPackage.h:
        * Plugins/WebBasePluginPackage.m:
        (-[WebBasePluginPackage versionNumber]): New method. CFBundleGetVersionNumber doesn't work with all possible versioning schemes,
        but we think for now it's good enough for us.
        * Plugins/WebPluginDatabase.m:
        (considerCandidate): Added a C utility function which compares the current plug-in against a candidate plug-in's version number.
        If both plug-ins have the same bundle ID and the candiate is newer, the current plug-in becomes the candidate.
        (-[WebPluginDatabase pluginForKey:withEnumeratorSelector:]): Calls the new considerCandidate() function.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@28081 268f45cc-cd09-0410-ab3c-d52691b4dbfc