fix for SH-2215: [crashhunters] crash at LLPluginClassMedia

indra/llplugin/llpluginclassmedia.h

@@ -41,16 +41,16 @@ class LLPluginClassMedia : public LLPluginProcessParentOwner
 	LOG_CLASS(LLPluginClassMedia);
 public:
 	LLPluginClassMedia(LLPluginClassMediaOwner *owner);
-	virtual ~LLPluginClassMedia();
+	~LLPluginClassMedia();
 
 	// local initialization, called by the media manager when creating a source
-	virtual bool init(const std::string &launcher_filename, 
+	bool init(const std::string &launcher_filename, 
 					  const std::string &plugin_dir, 
 					  const std::string &plugin_filename, 
 					  bool debug);
 
 	// undoes everything init() didm called by the media manager when destroying a source
-	virtual void reset();
+	void reset();
 	
 	void idle(void);
 	

indra/llplugin/llplugininstance.h

@@ -39,7 +39,7 @@
 class LLPluginInstanceMessageListener
 {
 public:
-	virtual ~LLPluginInstanceMessageListener();
+	~LLPluginInstanceMessageListener();
    /** Plugin receives message from plugin loader shell. */
 	virtual void receivePluginMessage(const std::string &message) = 0;
 };

indra/llplugin/llpluginmessagepipe.h

@@ -40,7 +40,8 @@ class LLPluginMessagePipeOwner
 	LOG_CLASS(LLPluginMessagePipeOwner);
 public:
 	LLPluginMessagePipeOwner();
-	virtual ~LLPluginMessagePipeOwner();
+	~LLPluginMessagePipeOwner();
+
 	// called with incoming messages
 	virtual void receiveMessageRaw(const std::string &message) = 0;
 	// called when the socket has an error

indra/llplugin/llpluginprocessparent.h

@@ -41,7 +41,7 @@
 class LLPluginProcessParentOwner
 {
 public:
-	virtual ~LLPluginProcessParentOwner();
+	~LLPluginProcessParentOwner();
 	virtual void receivePluginMessage(const LLPluginMessage &message) = 0;
 	virtual bool receivePluginMessageEarly(const LLPluginMessage &message) {return false;};
 	// This will only be called when the plugin has died unexpectedly