Use some FXSYS methods instead of duplicating

xfa/fxfa/parser/xfa_utils.h

Index: xfa/fxfa/parser/xfa_utils.h
diff --git a/xfa/fxfa/parser/xfa_utils.h b/xfa/fxfa/parser/xfa_utils.h
index 1036d9353f2a7baf22d5b293820fc11d928b4232..a9101092a8e52beae1258cd8aaa11a1004444eef 100644
--- a/xfa/fxfa/parser/xfa_utils.h
+++ b/xfa/fxfa/parser/xfa_utils.h
@@ -18,17 +18,11 @@ class CXFA_LocaleValue;
 class CXFA_Node;
 class CXFA_WidgetData;
 
-inline FX_BOOL XFA_IsSpace(FX_WCHAR c) {
-  return (c == 0x20) || (c == 0x0d) || (c == 0x0a) || (c == 0x09);
-}
-inline FX_BOOL XFA_IsDigit(FX_WCHAR c) {
-  return c >= '0' && c <= '9';
-}
-
 FX_BOOL XFA_FDEExtension_ResolveNamespaceQualifier(
     CFDE_XMLElement* pNode,
     const CFX_WideStringC& wsQualifier,
     CFX_WideString& wsNamespaceURI);
+
 template <class NodeType, class TraverseStrategy>
 class CXFA_NodeIteratorTemplate {
  public: