Split xfa_layout_appadapter

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 6b5e78d49a68788eb7a5d1a1c154bfb1e7988a6f..44f4fdd487094325c8812e6d1dcf11623b0ec936 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1473,6 +1473,8 @@ if (pdf_enable_xfa) {
       "xfa/fxfa/parser/cxfa_thisproxy.cpp",
       "xfa/fxfa/parser/cxfa_tooltip.cpp",
       "xfa/fxfa/parser/cxfa_tooltip.h",
+      "xfa/fxfa/parser/cxfa_traversestrategy_contentareacontainerlayoutitem.h",
+      "xfa/fxfa/parser/cxfa_traversestrategy_contentlayoutitem.h",
       "xfa/fxfa/parser/cxfa_traversestrategy_layoutitem.h",
       "xfa/fxfa/parser/cxfa_validate.cpp",
       "xfa/fxfa/parser/cxfa_validate.h",
@@ -1496,8 +1498,6 @@ if (pdf_enable_xfa) {
       "xfa/fxfa/parser/xfa_basic_data_packets.cpp",
       "xfa/fxfa/parser/xfa_document_datamerger_imp.cpp",
       "xfa/fxfa/parser/xfa_document_datamerger_imp.h",
-      "xfa/fxfa/parser/xfa_layout_appadapter.cpp",
-      "xfa/fxfa/parser/xfa_layout_appadapter.h",
       "xfa/fxfa/parser/xfa_layout_itemlayout.cpp",
       "xfa/fxfa/parser/xfa_layout_itemlayout.h",
       "xfa/fxfa/parser/xfa_layout_pagemgr_new.cpp",