Make CFX_ByteString(const CFX_ByteStringC&) explicit.

fpdfsdk/pdfwindow/PWL_Label.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/fxedit/include/fx_edit.h"
 #include "fpdfsdk/pdfwindow/PWL_Label.h"
 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/pdfwindow/PWL_Wnd.h"
@@ skipping 105 matching lines @@
 void CPWL_Label::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
   CPWL_Wnd::GetThisAppearanceStream(sAppStream);
 
   sAppStream << GetTextAppearanceStream(CFX_FloatPoint(0.0f, 0.0f)).AsStringC();
 }
 
 CFX_ByteString CPWL_Label::GetTextAppearanceStream(
     const CFX_FloatPoint& ptOffset) const {
   CFX_ByteTextBuf sRet;
   CFX_ByteString sEdit = CPWL_Utils::GetEditAppStream(m_pEdit, ptOffset);
-
   if (sEdit.GetLength() > 0) {
     sRet << "BT\n" << CPWL_Utils::GetColorAppStream(GetTextColor()).AsStringC()
          << sEdit.AsStringC() << "ET\n";
   }
-
-  return sRet.AsStringC();
+  return sRet.MakeString();
 }
 
 CFX_WideString CPWL_Label::GetText() const {
   return m_pEdit->GetText();
 }
 
 void CPWL_Label::SetLimitChar(int32_t nLimitChar) {
   m_pEdit->SetLimitChar(nLimitChar);
 }
 
 int32_t CPWL_Label::GetTotalWords() {
   return m_pEdit->GetTotalWords();
 }