Rename both As{Byte,Wide}StringC() helpers to AsStringC().

core/fpdfdoc/doc_formfield.cpp

Index: core/fpdfdoc/doc_formfield.cpp
diff --git a/core/fpdfdoc/doc_formfield.cpp b/core/fpdfdoc/doc_formfield.cpp
index 1adc92ae4ffc5b8665f3aeb668c21fb41b4ba5d1..103465a8e53cc1321567198485d4bbe4519d2808 100644
--- a/core/fpdfdoc/doc_formfield.cpp
+++ b/core/fpdfdoc/doc_formfield.cpp
@@ -1054,7 +1054,7 @@ void CPDF_FormField::LoadDA() {
   if (DA.IsEmpty()) {
     return;
   }
-  CPDF_SimpleParser syntax(DA.AsByteStringC());
+  CPDF_SimpleParser syntax(DA.AsStringC());
   syntax.FindTagParamFromStart("Tf", 2);
   CFX_ByteString font_name = syntax.GetWord();
   CPDF_Dictionary* pFontDict = NULL;
@@ -1062,7 +1062,7 @@ void CPDF_FormField::LoadDA() {
       m_pForm->m_pFormDict->GetDictBy("DR")->GetDictBy("Font"))
     pFontDict = m_pForm->m_pFormDict->GetDictBy("DR")
                     ->GetDictBy("Font")
-                    ->GetDictBy(font_name.AsByteStringC());
+                    ->GetDictBy(font_name.AsStringC());
 
   if (!pFontDict) {
     return;