Fixed: <rdar://problem/3546028>: Safari should not give plug-ins any time, thus use 0% CPU, when not in the currently active session

        Reviewed by john.

        * Plugins.subproj/WebBaseNetscapePluginView.m:
        (+[WebBaseNetscapePluginView initialize]): observe CG changes
        (-[WebBaseNetscapePluginView addWindowObservers]): observe user switch notifications
        (-[WebBaseNetscapePluginView removeWindowObservers]): stop observing user switch notifications
        (-[WebBaseNetscapePluginView viewHasMoved:]): tweak
        (-[WebBaseNetscapePluginView windowWillClose:]): tweak
        (-[WebBaseNetscapePluginView windowBecameKey:]): tweak
        (-[WebBaseNetscapePluginView windowResignedKey:]): tweak
        (-[WebBaseNetscapePluginView windowDidMiniaturize:]): tweak
        (-[WebBaseNetscapePluginView windowDidDeminiaturize:]): tweak
        (-[WebBaseNetscapePluginView loginWindowDidSwitchFromUser:]): new, stop null events
        (-[WebBaseNetscapePluginView loginWindowDidSwitchToUser:]): new, restart null events
        (ConsoleConnectionChangeNotifyProc): new, post user switch notifications


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@6033 268f45cc-cd09-0410-ab3c-d52691b4dbfc