Remove nsIBrowserWindow as that interface is going away.

xpcom/base/IIDS.h

@@ -98,12 +98,6 @@ nsILinkHandler = { /* a6cf905b-15b3-11d2-932e-00805f8add32 */
     0x11d2,
     {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}
   };
-nsIBrowserWindow = { /* a6cf905c-15b3-11d2-932e-00805f8add32 */
-    0xa6cf905c,
-    0x15b3,
-    0x11d2,
-    {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}
-  };
 nsBrowserWindow = { /* a6cf905d-15b3-11d2-932e-00805f8add32 */
     0xa6cf905d,
     0x15b3,