Make CFX_ByteString(const CFX_ByteStringC&) explicit.

core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp

Index: core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
diff --git a/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp b/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
index 3893d9bd416c7708d6336fbb37ce640dea819f0e..e9f5a6d468e891cd5582c88a6e3536cf34dfbf09 100644
--- a/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -528,7 +528,7 @@ CFX_ByteString PDF_EncodeString(const CFX_ByteString& src, FX_BOOL bHex) {
       result.AppendChar("0123456789ABCDEF"[src[i] % 16]);
     }
     result.AppendChar('>');
-    return result.AsStringC();
+    return result.MakeString();
   }
   result.AppendChar('(');
   for (int i = 0; i < srclen; i++) {
@@ -545,7 +545,7 @@ CFX_ByteString PDF_EncodeString(const CFX_ByteString& src, FX_BOOL bHex) {
     result.AppendChar(ch);
   }
   result.AppendChar(')');
-  return result.AsStringC();
+  return result.MakeString();
 }
 
 void FlateEncode(const uint8_t* src_buf,