Rename XFA_AttributeEnum to XFA_AttributeValue.

Because currently there are two enums, Attribute and AttributeEnum,
that sound too much alike. The second one enumerates the keyword
values that might be present for a given attribute.

Change-Id: I4eabda8e198d13c4a34ac57ec56af89546e2f2ec
Reviewed-on: https://pdfium-review.googlesource.com/c/46614
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/xfa/fxfa/parser/cxfa_encryptionmethods.cpp b/xfa/fxfa/parser/cxfa_encryptionmethods.cpp
index ad6beab..ff87597 100644
--- a/xfa/fxfa/parser/cxfa_encryptionmethods.cpp
+++ b/xfa/fxfa/parser/cxfa_encryptionmethods.cpp
@@ -12,7 +12,7 @@
     {XFA_Attribute::Id, XFA_AttributeType::CData, nullptr},
     {XFA_Attribute::Use, XFA_AttributeType::CData, nullptr},
     {XFA_Attribute::Type, XFA_AttributeType::Enum,
-     (void*)XFA_AttributeEnum::Optional},
+     (void*)XFA_AttributeValue::Optional},
     {XFA_Attribute::Usehref, XFA_AttributeType::CData, nullptr},
     {XFA_Attribute::Unknown, XFA_AttributeType::Integer, nullptr}};