Cleanup xfa_document_datamerge files

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index b0f89690a356e733ab0e75803c9c4f56b4807f0c..6fe33bb23c5123b40e0fad6e0cd1725c0e92ba7b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1363,19 +1363,17 @@ if (pdf_enable_xfa) {
       "xfa/fxfa/parser/cxfa_widgetdata.cpp",
       "xfa/fxfa/parser/cxfa_widgetdata.h",
       "xfa/fxfa/parser/xfa_basic_data.cpp",
+      "xfa/fxfa/parser/xfa_basic_data.h",
       "xfa/fxfa/parser/xfa_basic_data_attributes.cpp",
       "xfa/fxfa/parser/xfa_basic_data_element_attributes.cpp",
       "xfa/fxfa/parser/xfa_basic_data_element_properties.cpp",
       "xfa/fxfa/parser/xfa_basic_data_element_script.cpp",
       "xfa/fxfa/parser/xfa_basic_data_enum.cpp",
       "xfa/fxfa/parser/xfa_basic_data_packets.cpp",
-      "xfa/fxfa/parser/xfa_basic_data.h",
       "xfa/fxfa/parser/xfa_basic_imp.cpp",
       "xfa/fxfa/parser/xfa_basic_imp.h",
       "xfa/fxfa/parser/xfa_doclayout.h",
       "xfa/fxfa/parser/xfa_document.h",
-      "xfa/fxfa/parser/xfa_document_datadescription_imp.cpp",
-      "xfa/fxfa/parser/xfa_document_datadescription_imp.h",
       "xfa/fxfa/parser/xfa_document_datamerger_imp.cpp",
       "xfa/fxfa/parser/xfa_document_datamerger_imp.h",
       "xfa/fxfa/parser/xfa_document_imp.cpp",