Cleanup FDE interfaces.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index fd6faca9a186e4ee19d01b5d7d5d0073a785b2c4..a2e5ed9a8aba9176d6bb990439e4a44cfd41c9be 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -903,6 +903,8 @@ 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",
@@ -917,16 +919,12 @@ 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",