diff --git a/mozilla/widget/public/nsWidgetsCID.h b/mozilla/widget/public/nsWidgetsCID.h
index d9d86c4dfe9..7ce82f10304 100644
--- a/mozilla/widget/public/nsWidgetsCID.h
+++ b/mozilla/widget/public/nsWidgetsCID.h
@@ -27,19 +27,12 @@
     {0xa8, 0x27, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9} }
 
 
-
 /* BA7DE611-6088-11d3-A83E-00105A183419 */
 #define NS_POPUP_CID \
 { 0xba7de611, 0x6088, 0x11d3,  \
     { 0xa8, 0x3e, 0x0, 0x10, 0x5a, 0x18, 0x34, 0x19 } }
 
 
-/* 6B3E0621-608B-11d3-A83E-00105A183419} */
-#define NS_DIALOG_CID \
-{ 0x6b3e0621, 0x608b, 0x11d3, \
-    { 0xa8, 0x3e, 0x0, 0x10, 0x5a, 0x18, 0x34, 0x19 } }
-
-
 /* 2d96b3d2-c051-11d1-a827-0040959a28c9 */
 #define NS_BUTTON_CID \
 { 0x2d96b3d2, 0xc051, 0x11d1, \