make cocoa mediactrl usable. Some touchups to carbon mediactrl code. Add notebook support to mediaplayer sample.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31744 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mediactrl.h

@@ -191,7 +191,7 @@ protected:
     wxSize DoGetBestSize() const;
 
 #ifdef __WXMAC__
-    friend class wxMediaBackend;
+    friend class wxQTMediaBackend;
 #endif
 #ifdef __WXCOCOA__
     friend class wxQTMediaBackend;
@@ -262,11 +262,6 @@ public:
     virtual wxMediaState GetState()
     {   return wxMEDIASTATE_STOPPED;    }
 
-#ifdef __WXMAC__
-    wxMacControl* GetControlPeer(wxControl* ctrl) 
-    {	return ((wxMediaCtrl*)ctrl)->m_peer;	}
-#endif
-
     DECLARE_CLASS(wxMediaBackend)
 };