override IID method

mailnews/db/msgdb/public/nsIDBChangeListener.h

@@ -6,12 +6,16 @@
 class nsDBChangeAnnouncer;
 
 #define NS_IDBCHANGELISTENER_IID          \
-{ 0xad0f7f90, 0xbaff, 0x11d2, 0x8d67, 0x00, 0x80, 0x5f, 0x8a, 0x66, 0x17}
+{ 0xad0f7f90, 0xbaff, 0x11d2, { 0x8d, 0x67, 0x00, 0x80, 0x5f, 0x8a, 0x66, 0x17}}
 
 
 class nsIDBChangeListener : public nsISupports
 {
 public:
+ static const nsIID& IID() {
+    static nsIID iid = NS_IDBCHANGELISTENER_IID;
+    return iid;
+  }
 	NS_IMETHOD OnKeyChange(nsMsgKey aKeyChanged, int32 aFlags, 
 		nsIDBChangeListener * aInstigator) = 0;
 	NS_IMETHOD OnAnnouncerGoingAway(nsDBChangeAnnouncer * instigator) ;