Bug 917304 - Remove some dead code in docshell/; r=bzbarsky

docshell/base/nsDocShell.cpp

@@ -187,8 +187,6 @@
 #include "nsIWebBrowserFind.h"
 #include "nsIWidget.h"
 
-static NS_DEFINE_CID(kDOMScriptObjectFactoryCID,
-                     NS_DOM_SCRIPT_OBJECT_FACTORY_CID);
 static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
 
 #if defined(DEBUG_bryner) || defined(DEBUG_chb)