Unused FWL Classes.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index e3131481ece478d5a31eeac2a73cf5c7e5e1fd7a..33da956e798ac2f8164d90f62316f9850476f01c 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -42,9 +42,7 @@ config("pdfium_config") {
   }
 
   if (is_win) {
-    cflags += [
-      "/wd4267",
-    ]
+    cflags += [ "/wd4267" ]
   }
 
   if (is_clang || is_posix) {
@@ -1037,8 +1035,6 @@ if (pdf_enable_xfa) {
       "xfa/fwl/core/cfwl_widgetimpproperties.h",
       "xfa/fwl/core/fwl_appimp.cpp",
       "xfa/fwl/core/fwl_appimp.h",
-      "xfa/fwl/core/fwl_contentimp.cpp",
-      "xfa/fwl/core/fwl_contentimp.h",
       "xfa/fwl/core/fwl_error.h",
       "xfa/fwl/core/fwl_formimp.cpp",
       "xfa/fwl/core/fwl_formimp.h",
@@ -1062,16 +1058,12 @@ if (pdf_enable_xfa) {
       "xfa/fwl/core/ifwl_adapterthreadmgr.h",
       "xfa/fwl/core/ifwl_adapterwidgetmgr.h",
       "xfa/fwl/core/ifwl_app.h",
-      "xfa/fwl/core/ifwl_content.h",
-      "xfa/fwl/core/ifwl_custom.h",
-      "xfa/fwl/core/ifwl_custompanel.h",
       "xfa/fwl/core/ifwl_dataprovider.h",
       "xfa/fwl/core/ifwl_form.h",
       "xfa/fwl/core/ifwl_notedriver.h",
       "xfa/fwl/core/ifwl_noteloop.h",
       "xfa/fwl/core/ifwl_notethread.h",
       "xfa/fwl/core/ifwl_panel.h",
-      "xfa/fwl/core/ifwl_proxy.h",
       "xfa/fwl/core/ifwl_target.h",
       "xfa/fwl/core/ifwl_themeprovider.h",
       "xfa/fwl/core/ifwl_thread.h",
@@ -1082,8 +1074,6 @@ if (pdf_enable_xfa) {
       "xfa/fwl/core/ifwl_widgetmgr.h",
       "xfa/fwl/core/ifwl_widgetmgrdelegate.h",
       "xfa/fwl/core/include/ifwl_adaptertimermgr.h",
-      "xfa/fwl/lightwidget/cfwl_app.cpp",
-      "xfa/fwl/lightwidget/cfwl_app.h",
       "xfa/fwl/lightwidget/cfwl_barcode.cpp",
       "xfa/fwl/lightwidget/cfwl_barcode.h",
       "xfa/fwl/lightwidget/cfwl_checkbox.cpp",