Cleanup FDE interfaces.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 3ecc9a97e5f39cc2a2024930160b435da28b56da..bdc7570794b921523e13eb15f48c3d7a21bb11db 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -897,6 +897,8 @@ if (pdf_enable_xfa) {
 
   static_library("xfa") {
     sources = [
+      "xfa/fde/cfde_path.cpp",
+      "xfa/fde/cfde_path.h",
       "xfa/fde/css/fde_css.h",
       "xfa/fde/css/fde_csscache.cpp",
       "xfa/fde/css/fde_csscache.h",
@@ -911,16 +913,12 @@ if (pdf_enable_xfa) {
       "xfa/fde/css/fde_csssyntax.cpp",
       "xfa/fde/css/fde_csssyntax.h",
       "xfa/fde/fde_gedevice.cpp",
-      "xfa/fde/fde_gedevice.h",
-      "xfa/fde/fde_geobject.cpp",
       "xfa/fde/fde_geobject.h",
       "xfa/fde/fde_iterator.cpp",
       "xfa/fde/fde_iterator.h",
       "xfa/fde/fde_object.h",
-      "xfa/fde/fde_path.h",
       "xfa/fde/fde_render.cpp",
       "xfa/fde/fde_render.h",
-      "xfa/fde/fde_renderdevice.h",
       "xfa/fde/tto/fde_textout.cpp",
       "xfa/fde/tto/fde_textout.h",
       "xfa/fde/xml/fde_xml.h",