<rdar://problem/7273354> 

        * Plugins/WebBaseNetscapePluginView.h: Added _isHalted ivar and three new methods: -halt, -resumeFromHalt, and -isHalted
        * Plugins/WebBaseNetscapePluginView.mm:
        (WebHaltablePlugin::halt): Call -halt instead of -stop.  
        (WebHaltablePlugin::restart):Call -resumeFromHalt instead of -start. 
        (-[WebBaseNetscapePluginView halt]): Added. Stop the plug-in, update _isHalted.
        (-[WebBaseNetscapePluginView resumeFromHalt]): Added. Start the plug-in, update _isHalted.
        (-[WebBaseNetscapePluginView isHalted]): Added.
        * WebView/WebView.mm:
        (-[WebView _isNodeHaltedPlugin:]): Added. Queries a DOMNode to determine if it's a halted plug-in.
        * WebView/WebViewPrivate.h: Added _isNodeHaltedPlugin.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@49689 268f45cc-cd09-0410-ab3c-d52691b4dbfc