Delete "NULL terminator" CFXA_Node property/attribute records.

We are now using span<>, which knows its size, so these are
not needed.

Change-Id: I9f1b995c6e4174840d2357589c0706210b312fd4
Reviewed-on: https://pdfium-review.googlesource.com/c/48972
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

xfa/fxfa/parser/cxfa_documentassembly.cpp

diff --git a/xfa/fxfa/parser/cxfa_documentassembly.cpp b/xfa/fxfa/parser/cxfa_documentassembly.cpp
index 4cdadf3..c6582e8 100644
--- a/xfa/fxfa/parser/cxfa_documentassembly.cpp
+++ b/xfa/fxfa/parser/cxfa_documentassembly.cpp
@@ -14,7 +14,7 @@
 const CXFA_Node::AttributeData kDocumentAssemblyAttributeData[] = {
     {XFA_Attribute::Desc, XFA_AttributeType::CData, nullptr},
     {XFA_Attribute::Lock, XFA_AttributeType::Integer, (void*)0},
-    {XFA_Attribute::Unknown, XFA_AttributeType::Integer, nullptr}};
+};
 
 }  // namespace