Break xfa_basic_data up to smaller files

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 91348ce1850b28595ea8a18931d044b9cfc77b77..b0f89690a356e733ab0e75803c9c4f56b4807f0c 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1363,6 +1363,12 @@ 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_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",