Remove unused enum FWLTHEME_EDGE.

It is not referenced anywhere.

Change-Id: Idd48b959a43a8992c7572572829e0cdcb1d07aa8
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/83556
Auto-Submit: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/xfa/fwl/theme/cfwl_utils.h b/xfa/fwl/theme/cfwl_utils.h
index 2e548d5..d9185c6 100644
--- a/xfa/fwl/theme/cfwl_utils.h
+++ b/xfa/fwl/theme/cfwl_utils.h
@@ -9,12 +9,6 @@
 
 #include "core/fxge/dib/fx_dib.h"
 
-enum FWLTHEME_EDGE {
-  FWLTHEME_EDGE_Flat = 0,
-  FWLTHEME_EDGE_Raised,
-  FWLTHEME_EDGE_Sunken
-};
-
 enum FWLTHEME_STATE {
   FWLTHEME_STATE_Normal = 1,
   FWLTHEME_STATE_Hover,