Bug 159646 -- taking care of stale pointer in the plugin sample code, not part of the build

git-svn-id: svn://10.0.0.236/trunk@126581 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/modules/plugin/tools/sdk/samples/simple/nsScriptablePeer.h

@@ -98,6 +98,8 @@ public:
   // native methods callable from JavaScript
   NS_DECL_NSISIMPLEPLUGIN
 
+  void SetInstance(nsPluginInstance* plugin);
+
 protected:
   nsPluginInstance* mPlugin;
 };