Make CFX_WideString(const CFX_WideString&) explicit.

xfa/fxbarcode/cbc_datamatrix.cpp

Index: xfa/fxbarcode/cbc_datamatrix.cpp
diff --git a/xfa/fxbarcode/cbc_datamatrix.cpp b/xfa/fxbarcode/cbc_datamatrix.cpp
index 63385aa2db51fac30ad231fd46b4ddb26ba12897..7430187f5b4c7a71065c3d5c5afe52b383005b19 100644
--- a/xfa/fxbarcode/cbc_datamatrix.cpp
+++ b/xfa/fxbarcode/cbc_datamatrix.cpp
@@ -43,8 +43,9 @@ FX_BOOL CBC_DataMatrix::Encode(const CFX_WideStringC& contents,
                                int32_t& e) {
   int32_t outWidth = 0;
   int32_t outHeight = 0;
-  uint8_t* data = ((CBC_DataMatrixWriter*)m_pBCWriter)
-                      ->Encode(contents, outWidth, outHeight, e);
+  uint8_t* data =
+      ((CBC_DataMatrixWriter*)m_pBCWriter)
+          ->Encode(CFX_WideString(contents), outWidth, outHeight, e);
   BC_EXCEPTION_CHECK_ReturnValue(e, FALSE);
   ((CBC_TwoDimWriter*)m_pBCWriter)->RenderResult(data, outWidth, outHeight, e);
   FX_Free(data);
@@ -78,6 +79,6 @@ CFX_WideString CBC_DataMatrix::Decode(CFX_DIBitmap* pBitmap, int32_t& e) {
   CBC_GlobalHistogramBinarizer binarizer(&source);
   CBC_BinaryBitmap bitmap(&binarizer);
   CFX_ByteString retStr = m_pBCReader->Decode(&bitmap, 0, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, FX_WSTRC(L""));
+  BC_EXCEPTION_CHECK_ReturnValue(e, CFX_WideString());
   return CFX_WideString::FromUTF8(retStr.AsStringC());
 }