Adding the CID, progID, etc., so I can get the C++ version registered as a service. r=waterson

xpcom/components/nsICategoryManager.idl

@@ -116,4 +116,6 @@ interface nsICategoryManager : nsISupports
 #define NS_CATEGORYMANAGER_CID \
 { 0x16d222a6, 0x1dd2, 0x11b2, \
   {0xb6, 0x93, 0xf3, 0x8b, 0x02, 0xc0, 0x21, 0xb2} }
+
+extern "C" NS_EXPORT NS_CategoryManagerGetFactory( nsIFactory** );
 %}